HIGHCVSS v3.1 8.1Vulnerability
CVE-2026-77937
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.
Properties
- Severity
- HIGH
- Nvd fetched at
- 2026-10-20T21:14:08.448323+00:00
- Epss score
- 0.00401
- Cvss severity
- HIGH
- Cvss score
- 8.1
- Retrieved at
- 2026-10-21T01:24:50+00:00
- Last source
- FIRST EPSS
- Score
- 8.1
- Cvss version
- 3.1
- Cve id
- CVE-2026-77937
- Cvss vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- First seen by Signal
- 2026-10-20T04:27:34+00:00
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Published at
- 2026-10-20T01:17:20.263
- Last modified
- 2026-10-20T20:11:29.833
- Epss percentile
- 0.32968
Related Entities (1)
HAS_WEAKNESS (1)
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