remote code execution | Breaking Cybersecurity News | The Hacker News

A critical security vulnerability in Marimo , an open-source Python notebook for data science and analysis, has been exploited within 10 hours of public disclosure, according to findings from Sysdig. The vulnerability in question is CVE-2026-39987 (CVSS score: 9.3), a pre-authenticated remote code execution vulnerability impacting all versions of Marimo prior to and including 0.20.4. The issue has been addressed in version 0.23.0 . "The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary system commands," Marimo maintainers said in an advisory earlier this week. "Unlike other WebSocket endpoints (e.g., /ws) that correctly call validate_auth() for authentication, the /terminal/ws endpoint only checks the running mode and platform support before accepting connections, completely skipping authentication verification." In other words, at...

Unknown threat actors have hijacked the update system for the Smart Slider 3 Pro plugin for WordPress and Joomla to push a poisoned version containing a backdoor. The incident impacts Smart Slider 3 Pro version 3.5.1.35 for WordPress, per WordPress security company Patchstack. Smart Slider 3 is a popular WordPress slider plugin with more than 800,000 active installations across its free and Pro editions. "An unauthorized party gained access to Nextend’s update infrastructure and distributed a fully attacker-authored build through the official update channel," the company said . "Any site that updated to 3.5.1.35 between its release on April 7, 2026, and its detection approximately 6 hours later received a fully weaponized remote access toolkit." Nextend, which maintains the plugin, said an unauthorized party gained unauthorized access to its update system and pushed a malicious version (3.5.1.35 Pro) that remained accessible for approximately six hours, before ...

Threat actors have been exploiting a previously unknown zero-day vulnerability in Adobe Reader using maliciously crafted PDF documents since at least December 2025. The finding, detailed by EXPMON's Haifei Li, has been described as a highly-sophisticated PDF exploit. The artifact ("Invoice540.pdf") first appeared on the VirusTotal platform on November 28, 2025. A second sample was uploaded to VirusTotal on March 23, 2026. Given the name of the PDF document, it's likely that there is an element of social engineering involved, with the attackers luring unsuspecting users into opening the files on Adobe Reader. Once launched, it automatically triggers the execution of obfuscated JavaScript to harvest sensitive data and receive additional payloads. Security researcher Gi7w0rm, in an X post , said the PDF documents observed contain Russian language lures and refer to issues regarding current events related to the oil and gas industry i...

An active campaign has been observed targeting internet-exposed instances running ComfyUI, a popular stable diffusion platform, to enlist them into a cryptocurrency mining and proxy botnet. "A purpose-built Python scanner continuously sweeps major cloud IP ranges for vulnerable targets, automatically installing malicious nodes via ComfyUI-Manager if no exploitable node is already present," Censys security researcher Mark Ellzey said in a report published Monday. The attack activity, at its core, systemically scans for exposed ComfyUI instances and exploits a misconfiguration that allows remote code execution on unauthenticated deployments through custom nodes . Upon successful exploitation, the compromised hosts are added to a cryptomining operation that mines Monero via XMRig and Conflux via lolMiner, as well as to a Hysteria V2 botnet. Both of them are centrally managed through a Flask-based command-and-control (C2) dashboard. Data from the at...

Threat actors are exploiting a maximum-severity security flaw in Flowise , an open-source artificial intelligence (AI) platform, according to new findings from VulnCheck. The vulnerability in question is CVE-2025-59528 (CVSS score: 10.0), a code injection vulnerability that could result in remote code execution. "The CustomMCP node allows users to input configuration settings for connecting to an external MCP (Model Context Protocol) server," Flowise said in an advisory released in September 2025. "This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation." Flowise noted that successful exploitation of the vulnerability can allow access to dangerous modules such as child_process (command execution) and fs (file system), as it runs with full Node.js runtime privileges. Put differently, a threat actor who weaponizes the flaw can execu...