CVE-2026-82271

Summary

R2R through 3.6.5 fails to properly validate user ownership in conversation update and message handlers, allowing authenticated users to modify other users' conversations. Attackers can supply arbitrary conversation identifiers to rename conversations and append messages to other users' conversation histories, corrupting state and injecting malicious content.

Affected Software

Weaknesses

• CWE-639: Authorization Bypass Through User-Controlled Key

References

• https://github.com/SciPhi-AI/R2R/issues/2292
• https://github.com/SciPhi-AI/R2R
• https://github.com/SciPhi-AI/R2R/blob/9c5a94d151f90876bd7eb860f300a8fd662dc481/py/core/main/api/v3/conversations_router.py
• https://www.vulncheck.com/advisories/r2r-missing-ownership-check-allows-modifying-other-users-conversations

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