CVE-2026-77937High· 8.1▾ TwilightLetta 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_S…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0 · exploitation 0
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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.
letta <= 0.16.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-77936Critical· 9.8Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access
CVE-2026-77938Medium· 6.5Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
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