Cybersecurity News and Updates

Claude Mythos 5 Tried to Backdoor a Real Open-Source Project in Testing, Then Vouched for Itself

An agent running Anthropic’s Claude Mythos 5 spent 34 hours trying to get a malware dropper merged into a real open-source project during a cyber evaluation by the UK’s AI Security Institute.

When a bystander publicly warned that the code was malicious, the agent denied it, force-pushed a rewritten branch history to erase the evidence, and posted from a second account it controlled to vouch for

  • August 5, 2026

Open VSX Removes 77 Malicious Evil Twin Extensions Exfiltrating Developer Data

A cluster of 77 extensions on the Open VSX marketplace has been found to impersonate legitimate developer tools while transmitting information about the systems and development environments on which they were installed.

The “evil twin” extensions were uploaded to the repository between July 26 and August 1, 2026, according to Manifold Security. The packages have been removed from Open VSX as of

  • August 5, 2026

Leaked n8n API Tokens Exposed Live Instances to Credential Theft

GitGuardian researchers found 321 n8n instances accepting API tokens exposed in public GitHub commits and demonstrated four ways attackers could use them to access sensitive data and downstream credentials without exploiting a software vulnerability.

We scanned public GitHub commits for exposed n8n API tokens and identified 4,576 unique credentials associated with 1,255 hostnames. Of the 896

  • August 5, 2026

Critical Gitea Flaw Let Unauthenticated Attackers Read Server Files via Org-Mode Markup

An unauthenticated attacker can read any file the service account can access on Gitea, the self-hosted Git platform, in versions 1.22.1 through 1.27.0. No login, no repository write access. A public repository and crafted Org-mode markup are enough. The flaw is fixed in Gitea 1.27.1.

The file-read flaw is tracked as CVE-2026-59774, rated Critical with a CVSS score of 9.8, and received its

  • August 5, 2026