CVE-2026-77937

8.1 Élevée

Publiée le 20/10/2026 à 03:17 · Modifiée le 20/10/2026 à 22:11 · Analyse NVD reportée · Source : disclosure@vulncheck.com

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.

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Produits concernés

letta-ai letta

Scores CVSS

Version	Score	Source	Vecteur
4.0	8.6 Élevée	disclosure@vulncheck.com	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`
3.1	8.1 Élevée	disclosure@vulncheck.com	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`

Faiblesses (CWE)

CWE-639

Références

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

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories