GHSA-8p6h-849r-ww4hHighCVSS 8.1
Letta through 0.16.8 contains an authentication bypass vulnerability that allows API callers to...
🔗 CVE IDs covered (1)
📋 Description
Letta through 0.16.8 contains an authentication bypass vulnerability that allows API callers to impersonate other users by supplying a self-asserted user_id HTTP header. Attackers can set user_id to another tenant's ID, even with LETTA_SERVER_SECURE enabled, to read and modify that user's agents, memory and configuration.
🔗 References (5)
- https://nvd.nist.gov/vuln/detail/CVE-2026-77937
- https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/server/rest_api/dependencies.py#L39
- https://www.lasso.security/vulnerability-database/cve-2026-77937
- https://www.vulncheck.com/advisories/letta-through-0.16.8-cross-tenant-impersonation-via-user-id-header
- https://github.com/advisories/GHSA-8p6h-849r-ww4h