CVE-2026-121938

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    CVE-2026-121938

    Published: 4 Nov 2026Last Modified: 5 Nov 2026

    Summary: langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}

    Details: langchain4j-aideepin before 3.31.0 contains an insecure direct object reference vulnerability that allows authenticated users to read other users' character-chat conversations by supplying their character uuid. Attackers can request GET /character/{uuid}, which CharacterService.detail resolves without an ownership check, to obtain victims' questions, AI answers, and attachment and audio URLs.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121938.json, https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor, https://nvd.nist.gov/vuln/detail/CVE-2026-121938, https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid, https://github.com/moyangzhan/langchain4j-aideepin/issues/116, https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93, https://github.com/moyangzhan/langchain4j-aideepin/pull/117, https://github.com/moyangzhan/langchain4j-aideepin, https://github.com/moyangzhan/langchain4j-aideepin/blob/v3.30.0/server/adi-common/src/main/java/com/moyz/adi/common/service/CharacterService.java#L105-L125, https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -9b2fee6b66836a0efd5599cfcddd05b80b05ca93

    Affected versions

    v3.30.0

    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
    CVE-2026-121938 | CVE-DB