CVE-2026-77937
HIGH
CVSS 8.1
Published: 2026-10-20
Modified: 2026-10-20
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Threat Intelligence Pending
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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.
Quick Facts
| CVE ID | CVE-2026-77937 |
| CVSS Score | 8.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
| Published | 2026-10-20 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |