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Anthropic's Mythos AI autonomously discovered a critical vulnerability in Rejetto HTTP File Server caused by the use of non-cryptographic Math.random() for session signing, enabling attackers to forge admin sessions and execute arbitrary code. This finding highlights the persistent risks of relying on standard JavaScript pseudo-random number generators in security-sensitive contexts, even within open-source frameworks like Koa. The incident underscores Mythos's capability to identify high-severity flaws in third-party software through its Project Glasswing initiative.
Anthropic Mythos AI Finds Rejetto HFS Flaw That Lets Attackers Forge Admin Sessions and Execute Code

Anthropic’s Mythos AI has identified a critical vulnerability in Rejetto HTTP File Server that could allow remote attackers to forge administrator sessions and execute arbitrary code. The issue, tracked as CVE-2026-61500, stems from predictable session-signing keys generated through JavaScript’s non-cryptographic Math.random() function. Horizon3 made the finding after joining Anthropic’s Project Glasswing in July 2026, which […] The post Anthropic Mythos AI Finds Rejetto HFS Flaw That Lets Attackers Forge Admin Sessions and Execute Code appeared first on Cyber Security News.
Anthropic’s Mythos AI has identified a critical vulnerability in Rejetto HTTP File Server that could allow remote attackers to forge administrator sessions and execute arbitrary code. The issue, tracked as CVE-2026-61500, stems from predictable session-signing keys generated through JavaScript’s non-cryptographic Math.random() function. Horizon3 made the finding after joining Anthropic’s Project Glasswing in July…
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