CVE Feed

    Dashboard / CVE / CVE-2026-77937

    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.

    Published:Oct 20, 2026
    Last Modified:Oct 21, 2026
    EPS:Oct 20, 2026
    EPSS Score:0.00401
    CVSS Score:8.1

    Affected Products

    Vendor
    Letta
    Product
    Letta
    Vendor
    Letta-ai
    Product
    Letta

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High