{"id":"CVE-2026-121938","title":"langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}","summary":"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 …","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","cvssSource":"cna","cwe":["CWE-639"],"vendor":"moyangzhan","product":"langchain4j-aideepin","affected":["langchain4j-aideepin < 3.31.0"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-04T18:50:02.027188Z"},"exploitAvailable":true,"published":"2026-11-04","updated":"2026-11-04","sourceUpdated":"2026-11-04T18:50:28.489Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121938","references":[{"url":"https://github.com/moyangzhan/langchain4j-aideepin/issues/116"},{"url":"https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor"},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/pull/117"},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93"},{"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"},{"url":"https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid","label":"VulnCheck Advisory: langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}"}],"tags":["cve.org","exploit-available"],"ingestedAt":"2026-11-05T21:36:00.499Z","epss":0.00391,"epssPercentile":0.33435,"slug":"CVE-2026-121938","body":"## Overview\n\nlangchain4j-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.\n\n## Affected\n\n- `langchain4j-aideepin < 3.31.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}