{"id":"CVE-2026-121938","published":"2026-11-04T13:17:28.040","lastModified":"2026-11-04T19:17:34.013","description":"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.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-639"],"vendors":[],"products":[],"references":[{"url":"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","tags":[]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93","tags":[]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/issues/116","tags":[]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/pull/117","tags":[]},{"url":"https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor","tags":[]},{"url":"https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid","tags":[]},{"url":"https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor","tags":[]}],"exploitRefs":[{"url":"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","tags":[]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93","tags":[]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/issues/116","tags":[]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/pull/117","tags":[]}],"hasPoc":true,"ai":null}