What Happened
CVE-2026-61500 allows attackers to recover the session-cookie signing key and gain administrative access and RCE. The post Exploitation Hits Rejetto HFS Vulnerability Discovered by AI appeared first on SecurityWeek .
Why It Matters
SecurityWeek reports that CVE-2026-61500 in Rejetto HFS was discovered with assistance from Anthropic’s Mythos AI model and is being actively exploited. Attackers can recover the session-cookie signing key, forge administrator sessions, and achieve remote code execution; HFS 3.2.1 contains the fix. RealGround analysis: the primary AI relevance is the security and governance risk of AI-assisted vulnerability discovery entering the software supply chain, while the underlying exploit is a conventional application-security flaw.
RealGround Analysis
This signal maps to AI supply chain. Organizations using AI agents, LLM APIs, SaaS integrations, or sensitive data workflows should review whether this class of issue could create unauthorized tool execution, data leakage, weak approval gates, or unmanaged supply-chain exposure.
Recommended Actions
- Restrict AI agent tool permissions and production write paths.
- Review sensitive data access across prompts, logs, embeddings, memory, and SaaS integrations.
- Add human approval workflows for high-impact or state-changing actions.
- Run prompt injection and indirect prompt injection tests against affected workflows.
- Document the owner, control gap, and remediation deadline for this risk class.
Source
https://www.securityweek.com/exploitation-hits-rejetto-hfs-vulnerability-discovered-by-ai/
