{"id":"CVE-2026-121938","aliases":["EUVD-2026-116895","GHSA-j5gc-wvrm-78hc"],"status":"published","title":"langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}","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.","severity":{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-14","score":0.00391,"percentile":0.33738,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-639"],"published":"2026-11-04T12:31:17Z","modified":"2026-11-05T10:46:05Z","products":[{"vendor":"moyangzhan","product":"langchain4j-aideepin"}],"references":[{"url":"https://github.com/moyangzhan/langchain4j-aideepin/issues/116","tags":["issue-tracking","report"]},{"url":"https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/pull/117","tags":["issue-tracking","patch","fix"]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93","tags":["patch","fix"]},{"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":["technical-description","article"]},{"url":"https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid","tags":["third-party-advisory","advisory"]},{"url":"https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor","tags":["exploit","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121938","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j5gc-wvrm-78hc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121938.json","tags":["advisory"]},{"url":"https://github.com/moyangzhan/langchain4j-aideepin","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-121938","title":"langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}","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.","status":"published","published":"2026-11-04T12:31:17.804Z","modified":"2026-11-04T18:50:28.489Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-04T19:37:11.952963Z"}],"euvd":[{"id":"EUVD-2026-116895","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.","status":"published","published":"2026-11-04T12:31:17Z","modified":"2026-11-04T18:50:28Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-04T20:13:45.839046Z"}],"ghsa":[{"id":"GHSA-j5gc-wvrm-78hc","title":"langchain4j-aideepin before 3.31.0 contains an insecure direct object reference vulnerability...","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.","status":"published","published":"2026-11-04T15:32:29Z","modified":"2026-11-04T21:33:31Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-639"],"updated_at":"2026-11-04T21:42:47.217871Z"}],"nvd":[{"id":"CVE-2026-121938","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.","status":"published","published":"2026-11-04T13:17:28.04Z","modified":"2026-11-12T21:36:06.743Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-12T23:33:06.861048Z"}],"osv":[{"id":"CVE-2026-121938","title":"langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}","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.","status":"published","published":"2026-11-04T12:31:17.804Z","modified":"2026-11-14T02:30:20.421923635Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-639"],"updated_at":"2026-11-12T02:58:48.611889Z"}]}}