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Microsoft has unveiled two new open-source tools called RAMPART and Clarity to assist developers in better testing the security of artificial intelligence (AI) agents. RAMPART , short for Risk Assessment and Measurement Platform for Agentic Red Teaming, functions as a Pytest-native safety and security testing framework for writing and running safety and security tests for AI agents, covering both adversarial and benign issues, as well as various harm categories. Users can write test cases to attack or probe an AI agent to explore possible safety violations like cross-prompt injections, where untrusted data reaches an AI system indirectly via a data source (e.g., email, file, or a web page) processed by it, or unintended behavioral regressions and data exfiltration. RAMPART then evaluates the outcome of those tests and reports the results. All it needs is an adapter that connects an agent to the test suite. The tool builds on PyRIT (short for Python Risk Identification Tool), ...

Microsoft on Tuesday said it disrupted a malware-signing-as-a-service (MSaaS) operation that weaponized the company's Artifact Signing system to deliver malicious code and conduct ransomware and other attacks, compromising thousands of machines and networks across the world. The tech giant attributed the activity to a threat actor it calls Fox Tempest , which it said offered the MSaaS scheme to allow cybercriminals to disguise malware as legitimate software. The threat actor has been active since May 2025. The seizure effort has been codenamed OpFauxSign . "To disrupt the service, we seized Fox Tempest's website signspace[.]cloud, took offline hundreds of the virtual machines running the operation, and blocked access to a site hosting the underlying code," Steven Masada, assistant general counsel at Microsoft's Digital Crimes Unit, said . Microsoft noted that the operation enabled the deployment of Rhysida ransomware by threat actors such as Vanilla Tempe...

Cybersecurity researchers have flagged fresh activity from a China-aligned threat actor known as Webworm in 2025, deploying custom backdoors that employ Discord and Microsoft Graph API for command-and-control (C2 or C&C) communications. Webworm, first publicly documented by Broadcom-owned Symantec in September 2022, is assessed to be active since at least 2022, targeting government agencies and enterprises spanning IT services, aerospace, and electric power sectors in Russia, Georgia, Mongolia, and several other Asian nations. Attacks mounted by the group have leveraged remote access trojans (RATs) like Trochilus RAT, Gh0st RAT, and 9002 RAT (aka Hydraq and McRat). The threat actor is said to overlap with China-nexus clusters tracked as FishMonger (aka Aquatic Panda), SixLittleMonkeys , and Space Pirates . SixLittleMonkeys is best known for deploying Gh0st RAT and a RAT called Mikroceen targeting entities in Central Asia, Russia, Belarus, and Mongolia. "In recent ye...

New Industry Data Just Released Suggests Not. On May 19th, 2026, Orchid Security released the results of our Identity Gap: Snapshot 2026. Among the findings, "identity dark matter" (the unseen, unmanaged elements of identity) now overshadows the visible elements 57% vs. 43%. And it couldn't have occurred at a worse time, with enterprises embracing Agent AI with both arms (and unfortunately, as Orchid co-founder Robert Wiseman explains, more than one eye closed). 

GitHub on Tuesday said it's investigating unauthorized access to its internal repositories after the notorious threat actor known as TeamPCP listed the platform's source code and internal organizations for sale on a cybercrime forum. "While we currently have no evidence of impact to customer information stored outside of GitHub's internal repositories (such as our customers' enterprises, organizations, and repositories), we are closely monitoring our infrastructure for follow-on activity," the Microsoft-owned subsidiary said . The company also noted that it will notify customers via established incident response and notification channels if any impact is discovered. The development comes after TeamPCP, a threat actor behind a string of software supply chain attacks targeting open-source packages, listed GitHub's source code for sale for an asking price of no less than $50,000. The alleged data dump is said to include about 4,000 repositories. ...

AI-generated lookalike domains are now embedded inside the third-party scripts running on your web properties. Here's why your current stack can't see them, and what detection actually requires. Download the CISO Expert Guide to Typosquatting in the AI Era → TL;DR  Typosquatting is no longer a user problem. Attackers now embed lookalike domains inside legitimate third-party scripts. No mistyped URL required, no server breach needed. AI broke the economics of defense. LLMs generate thousands of convincing domain variants in minutes; full campaign deployment takes under ten. Malicious package uploads jumped 156% last year. Manual vetting is dead. Your security stack can't see this. Firewalls, WAFs, EDR, and CSP have no visibility into what approved scripts do once they execute in the browser. The Trust Wallet attack proved it. $8.5M stolen in 48 hours through a trojanized Chrome extension. No alert fired, not because something failed, but because nothing...

Microsoft on Tuesday released a mitigation for a BitLocker bypass vulnerability named YellowKey following its public disclosure last week. The zero-day flaw, now tracked as CVE-2026-45585 , carries a CVSS score of 6.8. It has been described as a BitLocker security feature bypass. "Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as 'YellowKey,'" the tech giant said in an advisory. "The proof of concept for this vulnerability has been made public, violating coordinated vulnerability best practices." The issue impacts Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows Server 2025, and Windows Server 2025 (Server Core installation). YellowKey was disclosed by a security researcher named Chaotic Eclipse (aka Nightmare-Eclipse). It essentially involves placing specially crafted 'FsTx' files on a USB driv...

Grafana Labs, on May 19, 2026, said an investigation into its recent breach found no evidence of customer production systems or operations being compromised. It said the scope of the incident is limited to the Grafana Labs GitHub environment, which includes public and private source code along with internal GitHub repositories. "After the initial assessment, we found that in addition to source code, the downloaded content included GitHub repositories that some Grafana Labs teams use to collaborate on and store internal operational information and other details about our business," it said . "This includes business contact names and email addresses that would be exchanged in a professional relationship context, not information pulled from or processed through the use of production systems or the Grafana Cloud platform." The open-source visualization software maker also noted that the breach originated from the TanStack npm supply chain attack orchestrated ...

Cybersecurity researchers have disclosed details of a new ad fraud and malvertising operation dubbed Trapdoor targeting Android device users. The activity, per HUMAN's Satori Threat Intelligence and Research Team, encompassed 455 malicious Android apps and 183 threat actor-owned command-and-control (C2) domains, turning the infrastructure into a pipeline for multi-stage fraud. "Users unwittingly download a threat actor-owned app, often a utility-style app like a PDF viewer or device cleanup tool," researchers Louisa Abel, Ryan Joye, João Marques, João Santos, and Adam Sell detailed in a report shared with The Hacker News. "These apps trigger malvertising campaigns that coerce users into downloading additional threat actor-owned apps. The secondary apps launch hidden WebViews, load threat actor-owned HTML5 domains, and request ads." The campaign, the cybersecurity company added, is self-sustaining in that an organic app install turns into an illicit re...

Proof-of-concept (PoC) exploit code has now been released for a recently patched security flaw in the Linux kernel that could allow for local privilege escalation (LPE). Dubbed DirtyDecrypt (aka DirtyCBC), the vulnerability was discovered and reported by the Zellic and V12 security team on May 9, 2026, only to be informed by the maintainers that it was a duplicate of a vulnerability that had already been patched in the mainline. "It's a rxgk pagecache write due to missing COW [copy-on-write] guard in rxgk_decrypt_skb," Zellic co-founder Luna Tong (aka cts and gf_256) said in a description shared on GitHub. Although the CVE identifier was not disclosed, the vulnerability in question is CVE-2026-31635 (CVSS score: 7.5) based on the fact that the NIST National Vulnerability Database (NVD) includes a link to the DirtyDecrypt PoC in its CVE record. "The specific fault sits in rxgk_decrypt_skb(), the function that decrypts an incoming sk_buff (socket buffer) on th...

In February 2026, a phishing-as-a-service (PhaaS) platform called EvilTokens went live. Within five weeks, it had compromised more than 340 Microsoft 365 organizations across five countries.  The targets of the platform received a message asking them to enter a short code at microsoft.com/devicelogin and complete their normal MFA challenge, then walked away believing they had verified a routine sign-in. They had actually handed the operator a valid refresh token scoped to their mailbox, drive, calendar, and contacts, with the lifespan of a tenant policy rather than a session. The operator never needed a password, never tripped an MFA prompt, and never produced a sign-in event that looked like an intrusion. The attack succeeded because the OAuth consent screen has become an instinctive click, and the controls built to stop credential phishing do not look at the consent layer. Security researchers call the resulting condition consent phishing or OAuth grant abuse. The phishin...

Drupal has issued an alert stating that it intends to release a "core security release" for all supported branches on May 20, 2026, from 5-9 p.m. UTC. "The Drupal Security Team urges you to reserve time for core updates at that time because exploits might be developed within hours or days," the maintainers of the PHP-based content management system (CMS) said . "Not all configurations are affected. Reserve time on May 20 during the release window to determine whether your sites are affected and in need of an immediate update. Mitigation information will be included in the advisory." It's being advised to update to the latest supported patch for the site's version of Drupal before the deadline so that any outstanding upgrade issues can be addressed. Patches are expected to be available for the following supported branches of Drupal core - 11.3.x 11.2.x 10.6.x 10.5.x "Sites on one of these supported versions should updat...

Critical security vulnerabilities have been disclosed in SEPPMail Secure E-Mail Gateway , an enterprise-grade email security solution, that could be exploited to achieve remote code execution and enable an attacker to read arbitrary mails from the virtual appliance. "These vulnerabilities could have been exploited to read all mail traffic or as an entry vector into the internal network," InfoGuard Labs researchers Dario Weiss, Manuel Feifel, and Olivier Becker said in a Monday report. The list of identified flaws is as follows - CVE-2026-2743 (CVSS score: 10.0) - A path traversal vulnerability in the SeppMail User Web Interface's large file transfer (LFT) feature that could enable arbitrary file write, resulting in remote code execution. CVE-2026-7864 (CVSS score: 6.9) - An exposure of sensitive system information vulnerability that leaks server environment variables through an unauthenticated endpoint in the new GINA UI. CVE-2026-44125 (CVSS score: 9.3) - A mi...

Cybersecurity researchers have flagged a compromised version of the Nx Console extension that was published to the Microsoft Visual Studio Code (VS Code) Marketplace. The extension in question is rwl.angular-console (version 18.95.0), a popular user interface and plugin for code editors like VS Code, Cursor, and JetBrains. The VS Code extension has more than 2.2 million installations. The Open VSX version has not been affected by the incident. "Within seconds of a developer opening any workspace, the compromised extension silently fetched and executed a 498 KB obfuscated payload from a dangling orphan commit hidden inside the official nrwl/nx GitHub repository," StepSecurity researcher Ashish Kurmi said . The payload is a "multi-stage credential stealer and supply chain poisoning tool" that harvests developer secrets and exfiltrates them via HTTPS, the GitHub API, and DNS tunneling. It also installs a Python backdoor on macOS systems that abuses the GitHub S...

In yet another software supply chain attack, threat actors have compromised the popular GitHub Actions workflow, actions-cool/issues-helper , to run malicious code that harvests sensitive credentials and exfiltrates them to an attacker-controlled server. "Every existing tag in the repository has been moved to point to an imposter commit that does not appear in the action's normal commit history," StepSecurity researcher Varun Sharma said . "That commit contains malicious code that exfiltrates credentials from CI/CD pipelines that run the action." An imposter commit refers to a deceptive software supply chain attack strategy in which malicious code is injected into a project by referencing a commit or tag that exists only in an adversary-controlled fork, rather than the original trusted repository. As a result, attackers can bypass standard Pull Request (PR) reviews and achieve arbitrary code execution. The imposter commit, per the cybersecurity company, ...

Cybersecurity researchers have discovered a fresh software supply chain attack campaign that has compromised various npm packages associated with the @antv ecosystem as part of the ongoing Mini Shai-Hulud attack wave. "The attack affects packages tied to the npm maintainer account atool, including echarts-for-react, a widely used React wrapper for Apache ECharts with roughly 1.1 million weekly downloads," Socket said . The list of affected packages include @antv packages such as @antv/g2, @antv/g6, @antv/x6, @antv/l7, @antv/s2, @antv/f2, @antv/g, @antv/g2plot, @antv/graphin, and @antv/data-set, as well as related packages outside the @antv namespace, including echarts-for-react, timeago.js, size-sensor, canvas-nest.js, and others. The application security company said the tradecraft matches Mini Shai-Hulud, where a compromised maintainer account is leveraged to push out trojanized versions in quick succession. The development comes as the supply chain attack campaign...

INTERPOL has coordinated a first-of-its-kind cybercrime crackdown across the Middle East and North Africa (MENA) that led to 201 arrests and the identification of an additional 382 suspects. The initiative involved the efforts of 13 countries from the region between October 2025 and February 2026, aiming to investigate and neutralize malicious infrastructure, arrest perpetrators behind these activities, and prevent future losses. "The operation focused on neutralizing phishing and malware threats, as well as tackling cyber scams that inflict severe cost to the region," INTERPOL said in a statement. "In addition to the arrests made, 3,867 victims were identified, and 53 servers were seized." The operation, codenamed Ramz , led to the disruption of a phishing-as-a-service (PhaaS) by Algerian authorities after its server was confiscated, along with a computer, a mobile phone, and hard drives containing phishing software and scripts. One suspect was arrested in con...

Monday opens with a trust problem. A mail server flaw is under active use. A network control system was targeted. Trusted packages were poisoned. A fake model page pushed a stealer. Then came the familiar ransom claim: the data was returned and deleted. The pattern is clear. One weak dependency can leak keys. One leaked key can open cloud access. One cloud foothold can become a production incident. AI is speeding up vulnerability discovery, attackers are moving quickly, and old exposure still keeps paying off. Patch the quiet risks first. Let’s get into it. ⚡ Threat of the Week On-Prem Microsoft Exchange Server Exploited in the Wild —Microsoft disclosed a security vulnerability impacting on-premise versions of Exchange Server, which has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-42897 (CVSS score: 8.1), has been described as a spoofing bug stemming from a cross-site scripting flaw. An anonymous researcher has been credited with discovering ...

What happens when a phishing email looks clean enough to pass through security, but dangerous enough to expose the business after one click? That is the gap many SOCs still struggle with: the attacks that leave teams unsure what was exposed, who else was targeted, and how far the risk has spread. Early phishing detection closes that gap. It helps teams move from uncertainty to evidence faster, reduce response delays, and stop one missed link from turning into account exposure, remote access, or operational disruption. Why Phishing Creates Bigger Risk for Security Leaders Now Phishing has become harder to manage because it no longer creates one clear, easy-to-contain event. A single click can turn into identity exposure, remote access, data access, or a wider investigation before the team has a clear picture. What makes it a bigger concern now: Puts identity at the center of the attack: Stolen credentials can expose email, SaaS apps, cloud platforms, and internal systems. Weak...

Supply chain attackers are not only trying to slip malicious code into trusted software. They are trying to steal the access that makes trusted software possible. Recently, three separate campaigns hit npm, PyPI, and Docker Hub in a 48-hour window, and all three targeted secrets from developer environments and CI/CD pipelines, including API keys, cloud credentials, SSH keys, and tokens. This is an ongoing concern and is self-propagating, as seen in attacks like the "mini Shai Hulud" campaigns.  That pattern should change how security teams think about the software supply chain. Traditionally, security focused on shared systems like source code repositories, CI/CD platforms, artifact registries, package managers, and cloud environments. The goal was to protect production workloads and data. We absolutely still need to focus on these areas, but it is an incomplete picture.  Modern software delivery begins before code reaches Git. It begins on the developer workstation, wher...