Vulnerability | Breaking Cybersecurity News | The Hacker News

Bad actors are exploiting multiple security vulnerabilities in Fortinet FortiSandbox, according to threat intelligence firm Defused Cyber. In a post shared on X, the company said it has observed exploitation of CVE-2026-39813, CVE-2026-39808 , and CVE-2026-25089 over the past 24 hours. CVE-2026-39813 (CVSS score: 9.1) refers to a path traversal vulnerability in FortiSandbox JRPC API that could allow an unauthenticated attacker to bypass authentication via specially crafted HTTP requests. The second flaw, CVE-2026-39808 (CVSS score: 9.1), is a case of operating system command injection that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests. Both vulnerabilities were patched by Fortinet in April 2026. CVE-2026-25089 (CVSS score: 9.1), on the other hand, was fixed last week, with Fortinet describing it as an operating system command injection impacting FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS WEB UI that co...

Cisco has released security updates for a medium-severity security flaw in Catalyst SD-WAN Manager that has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-20262 , carries a CVSS score of 6.5 out of 10.0. "A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker to create a file or overwrite any file on the filesystem of an affected system," Cisco said in an advisory. The issue, the networking equipment company added, stems from inadequate validation of user-supplied input during a file upload process. An attacker could exploit this behavior to create or overwrite any file on the underlying operating system by sending crafted HTTP requests to an affected API endpoint. This, in turn, could be weaponized to elevate to the root. However, successful exploitation hinges on the attacker already having valid credentials with at least write access. The vulnerab...

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a security flaw impacting LiteSpeed cPanel Plugin to its Known Exploited Vulnerabilities ( KEV ) catalog, requiring Federal Civilian Executive Branch (FCEB) agencies to apply the fixes by June 18, 2026. The vulnerability in question is CVE-2026-54420 (CVSS score: 8.5), which has been described as a case of privilege escalation. It allows a user with FTP or web shell access to escalate privileges to root on shared hosting servers running CloudLinux or CageFS. "LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before 5.3.2.0) mishandles symlinks provided by a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS," according to a description of the vulnerability in CVE.org. It's currently not known how the vulnerability is being exploited in the wild and if any of those attacks have been successful, but LiteSpeed has urged users to ...

A default low-privilege account on a LiteLLM proxy can climb to full admin and run code on the server by chaining three vulnerabilities, researchers at Obsidian Security disclosed LiteLLM is a widely deployed open-source AI gateway that brokers calls to more than 100 model providers behind one OpenAI-compatible interface. A server takeover exposes every provider key it holds, the secrets that decrypt its stored credentials, and every prompt and response passing through it. Obsidian rates the full chain CVSS 9.9, in the Critical range. BerriAI , the maintainer, included the complete fix set in LiteLLM v1.83.14-stable, which GitHub lists as released May 2. Upgrade to that release or later to close the three-CVE chain. The three bugs The first link is CVE-2026-47101 , an authorization bypass. When a regular user (an internal_user) generates a virtual API key, LiteLLM stores the caller-supplied allowed_routes field without checking it against the user's role. The field is...

A single click on a trusted Microsoft link could have let an attacker pull emails, calendar details, and indexed files out of Microsoft 365 Copilot Enterprise Search. Researchers at Varonis Threat Labs chained three bugs into a one-click exfiltration path they call SearchLeak . Because the link pointed to a real microsoft.com domain, traditional anti-phishing and URL filtering tools were unlikely to flag it. No prompt, no password, no second click. Microsoft assigned CVE-2026-42824 and marked it critical; the CVSS scores ran lower and disagreed, 6.5 from Microsoft and 7.5 from the National Vulnerability Database . The company mitigated the flaw on its backend, so customers have nothing to worry about, and Varonis presented a proof-of-concept, not observed exploitation. Three bugs, one click Microsoft's advisory describes the flaw as a command injection that can expose information over a network. In practice, SearchLeak stacks one AI-specific weakness on two old web bugs, ...

Stuff broke again. Not in a movie way. An old tool was left exposed. An abandoned package was abused. A deprecated feature was still running in prod. This week is the same lesson in a new form: phishing kits are easier to rent, AI names are useful bait, old login paths still fail, and forgotten software keeps becoming someone else's entry point. Scroll through the full Monday Cybersecurity Recap below for the news, tools, webinars, and fixes worth your time this week. ⚡ Threat of the Week Google Patches Actively Exploited Chrome 0-Day - Google released security updates to address 74 vulnerabilities, including one that has come under active exploitation in the wild. The high-severity vulnerability, tracked as CVE-2026-11645 (CVSS score: 8.8), has been described as an out-of-bounds memory access in V8, Chrome's JavaScript and WebAssembly engine. Google acknowledged that an "exploit for CVE-2026-11645 exists in the wild," but stopped short of sharing addition...

Palo Alto Networks has revealed that it has observed "active exploitation" of a recently disclosed PAN-OS vulnerability by an unknown threat actor to obtain unauthorized access to GlobalProtect portals. The vulnerability in question is CVE-2026-0257 (CVSS score: 7.8), an authentication bypass flaw affecting the portal and gateway components of PAN-OS software that could be exploited by bad actors to set up VPN connections. According to the network security company, the security defect could be exploited by a bad actor to bypass security controls and initiate VPN connections. The vulnerability has been exploited in the wild in limited attacks, with initial activity observed on May 17, 2026. It's currently unknown who is behind the exploitation efforts. "No post-access behavior or lateral movement has been identified as of this time," Palo Alto Networks said . "Only a small portion of the probed devices actually established VPN sessions, resulting ...

Splunk has released security updates to address a critical security flaw in Splunk Enterprise that could be exploited to conduct unauthenticated file operations and even remote code execution. The vulnerability, tracked as CVE-2026-20253 , is rated 9.8 on the CVSS scoring system. "In Splunk Enterprise versions below 10.2.4 and 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint," Splunk said in an alert this week. "The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials." The issue has been addressed in the following versions - Splunk Enterprise 10.0.0 to 10.0.6 - Fixed in 10.0.7 Splunk Enterprise 10.2.0 to 10.2.3 - Fixed in 10.2.4 Splunk Enterprise 10.4 - Not affected Splunk, which is part of Cisco, said Splunk Cloud is not impacted by the vulnera...

Cybersecurity researchers have described what they say is a new class of attack that can trick artificial intelligence (AI) coding agents into running arbitrary code on developer machines. Called Agentjacking by Tenet Security, the attack can be triggered by means of a fake error report crafted using Sentry, an open-source error-tracking and performance-monitoring platform. "The attack exploits a critical architectural flaw at the intersection of Sentry's event ingestion (which accepts arbitrary payloads from anyone with the DSN) and the Sentry MCP server (which returns this data to AI agents as trusted system output)," security researchers Ron Bobrov, Barak Sternberg, and Nevo Poran said . The idea is to inject crafted input into Sentry error events, which are then interpreted by coding agents like Claude Code and Cursor as legitimate diagnostic resolution steps and run attacker-controlled code. A successful attack of this kind can expose sensitive data, includ...

The ShinyHunters extortion crew exploited an unpatched flaw in Oracle PeopleSoft to break into enterprise systems, steal data, and demand payment to keep it private. The campaign hit universities hardest. Google's Mandiant attributes it to the group it tracks as UNC6240, and dates the activity between May 27 and June 9. Oracle did not publish its advisory until June 10, so the bug was a zero-day the entire time. The flaw, CVE-2026-35273 , is a remote code execution bug in PeopleSoft Enterprise PeopleTools rated 9.8 out of 10. It needs no login and no user interaction, just network access over HTTP, to take over the server. If you run PeopleSoft with the Environment Management Hub reachable from outside, that is your exposure, and the immediate move is to lock those endpoints down. The vulnerability sits in the Updates Environment Management component, the piece behind the Environment Management Hub (PSEMHUB). Oracle lists PeopleTools 8.61 and 8.62 as affected and says earl...

Security researcher Chaotic Eclipse (aka Nightmare-Eclipse and MSNightmare) has released a new Windows BitLocker bypass dubbed GreatXML , a day after they published an exploit for Microsoft Defender. "This was an accidental discovery, it took a total of 4 hours to find this," the researcher said in a post on Blogger. "If you ever attempted to use Windows Defender Offline Scan , you're automatically vulnerable to a BitLocker bypass. I'm unsure if you can still trigger the bug without ever using the offline scan feature, because you can definitely." The exploit works as follows - Copy an XML file ("unattend.xml") and a recovery folder containing another XML file ("Recovery/WindowsRE/ReAgent.xml") to the root of the recovery partition. Reboot to Windows Recovery Environment ( WinRE ) by holding Shift while clicking Restart in the Windows power menu. If every step is followed correctly, the result is a shell spawned with unre...

It's been one of those weeks. You expect the usual noise: recycled malware, sloppy attacks, another easy target getting hit. Instead, there's a supply chain attack kit in a public repo, a $5,000-a-month RAT that clones browsers, and research showing AI agents can be tricked into leaking real credentials. The bigger problem is how polished this all looks now. Mule networks run like SaaS. Deepfake KYC bypass is sold as a feature. Endpoint tools can be quietly weakened using built-in OS settings, with no exploit needed. Here's the full list of threats, tools, flaws, and updates worth knowing.

For thirty years, vulnerability management ran on a buffer: the months between when a vulnerability was found and when someone could figure out how to weaponize it. The solution was straightforward enough; triage by severity, schedule the fix, validate, and move on. The buffer was what made that work. Today, that buffer is gone. AI didn't make your team slower. It changed the other side of the equation, compressing discovery-to-exploit from months to hours . And the sad truth for defenders is that a process built for breathing room can't survive without it. AI Turned Vulnerability Discovery Into a Volume Game In its May 2026 update, Anthropic reported that it and approximately 50 partners used Claude Mythos Preview to find more than 10,000 high- or critical-severity vulnerabilities in systemically important software in a single month. Earlier figures were just as stark. Pointed at Firefox, the gated Mythos model wrote 181 working exploits , against just 2 from t...

Cybersecurity researchers have warned of a "resurgence and expansion" of JDY , a covert network associated with China-nexus state-sponsored threat actors. "The JDY botnet comprises over 1,500 SOHO [small office and home office] and IoT devices and operates as a centrally controlled, high-performance scanner used to discover, fingerprint, and continuously map exposed services at scale," Lumen's Black Lotus Labs said in a report shared with The Hacker News. JDY was first flagged as a cluster within another botnet codenamed KV-botnet in mid-December 2023. Primarily used for broader scanning against internet targets, the stealthy network comprising compromised SOHO routers, firewalls, and IoT devices has been put to use by Chinese hacking groups like Volt Typhoon. Following KV-botnet's takedown by the U.S. government in early 2024, the botnet operators began making behavioral changes to the network, with the second KV cluster largely going offline. It...

Fortinet, Ivanti, and SAP have released security updates to address multiple critical security vulnerabilities that could result in arbitrary code execution and information disclosure. The security flaw patched by Fortinet relates to a command injection vulnerability in FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS WEB UI. It's tracked as CVE-2026-25089 (CVSS score: 9.1). "An improper neutralization of special elements used in an OS command vulnerability [CWE-78] in FortiSandbox, FortiSandbox Cloud and FortiSandbox PaaS WEB UI may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests," Fortinet said . The issue impacts the following products and versions - FortiSandbox 5.0.0 through 5.0.5 (Upgrade to 5.0.6 or above) FortiSandbox 4.4.0 through 4.4.8 (Upgrade to 4.4.9 or above) FortiSandbox Cloud 5.0.4 through 5.0.5 (Upgrade to 5.0.6 or above) FortiSandbox PaaS 5.0.4 through 5.0.5 (Upgrade t...

A high-severity security flaw in Langflow, an open-source low-code platform to build artificial intelligence (AI) applications, has come under active exploitation in the wild, according to findings from VulnCheck. The vulnerability in question is CVE-2026-5027 (CVSS score: 8.8), a case of path traversal that could allow an attacker to write files to arbitrary locations. "The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../')," Tenable, which discovered the flaw, said in an alert released in late March 2026. The cybersecurity company said it attempted to contact the project maintainers three times in January and February 2026, before disclosing details of the issue on March 27. Caitlin Condon, vice president of security research at VulnCheck, said in a LinkedIn post that the v...

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Tuesday added three new vulnerabilities to its Known Exploited Vulnerabilities ( KEV ) catalog, following reports of active exploitation. The list of vulnerabilities is as follows - CVE-2026-20245 (CVSS score: 7.8) - An improper encoding or escaping of output vulnerability in Cisco Catalyst SD-WAN Manager that could allow an authenticated, local attacker to execute arbitrary commands as root by supplying a crafted file to the affected system. CVE-2026-11645 (CVSS score: 8.8) - An out-of-bounds read and write vulnerability in Google Chrome V8 that could allow a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. CVE-2026-7473 (CVSS score: 6.9) - An incomplete comparison with missing factors vulnerability in Arista Extensible Operating System (EOS) that could be exploited to process non-configured tunnel traffic. No Patch Planned for Exploited Arista EOS Flaw "On...

Microsoft on Tuesday released fixes for a record 206 security vulnerabilities impacting its software portfolio, including three flaws that have been publicly disclosed at the time of release. Of the 206 flaws, 39 are rated Critical, and 167 are rated Important in severity. This includes 63 privilege escalation, 56 remote code execution, 30 information disclosure, 27 spoofing, 20 security feature bypass, seven denial-of-service, and three tampering vulnerabilities. The patches also include two non-Microsoft CVEs, a privilege escalation vulnerability impacting Windows Kernel ( CVE-2025-10263 ) and a UEFI Secure Boot security feature bypass ( CVE-2026-8863 ). They are in addition to more than 350 security flaws that Google has addressed in Chromium, which is used in Microsoft's Edge browser. Topping the list of fixes is CVE-2026-45657 (CVSS score: 9.8), a use-after-free flaw affecting Windows Kernel that could result in remote code execution. "An attacker could exploi...

On June 9, Anthropic released Claude Fable 5 , the most capable model it has ever made, generally available. It also did something unusual: it shipped one model as two products, split not by capability but by a layer of safety classifiers. Fable 5 goes to the public. Its twin, Claude Mythos 5, the same underlying model with the cyber safeguards lifted, stays locked to a vetted group of cyber defenders and critical infrastructure operators. Anthropic calls Mythos 5 the strongest cybersecurity model in the world. The practical difference is this: Fable 5 routes flagged cyber, biology, chemistry, and distillation requests to the weaker Claude Opus 4.8, while Mythos 5 keeps the cyber capabilities available for vetted users. Both models cost $10 per million input tokens and $50 per million output tokens, less than half the price of the earlier Mythos Preview, and Fable 5 is available through the Claude API now. It is included on Pro, Max, Team, and seat-based Enterprise plans at no...

ServiceNow has warned about a security incident in which unknown threat actors exploited a flaw to obtain deeper unauthorized access to susceptible instances. "On June 5, 2026, ServiceNow applied a security update to hosted customer instances," the company revealed in an advisory that requires customer access. "The update concerned a security issue that could allow an unauthenticated user, in certain circumstances, to gain greater access to ServiceNow instances than intended." The security update makes changes to an endpoint configuration to limit this access to authenticated users. The security flaw currently does not have a CVE identifier. Details of the issue first emerged on Reddit. ServiceNow said it detected anomalous activity relating to the security issue, and that it observed evidence of successful queries of instance tables against a "subset of customers." Impacted customers have been notified, it added. "The security issue pertai...