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CVE-2026-121938langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}
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.
6.0 MEDIUMEPSS 0.39%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.0 | MEDIUM | 4.0VulnCheck (CNA) | 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 |
| 5.3 | MEDIUM | 3.1VulnCheck (CNA) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
Details
- CVE ID
- CVE-2026-121938
- Status
- Received
- Assigner (CNA)
- VulnCheck
- Published
- Nov 4, 2026
- Last modified
- 2026-11-04 19:17 UTC
- Weaknesses
- CWE-639 · Authorization Bypass Through User-Controlled Key
Affected Products
As published by the CNA in the CVE record.
moyangzhanlangchain4j-aideepin1 version range
- before 3.31.0
References
- github.com 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
- github.com https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93
- github.com https://github.com/moyangzhan/langchain4j-aideepin/issues/116
- github.com https://github.com/moyangzhan/langchain4j-aideepin/pull/117
- hackmd.io https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor
- vulncheck.com https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid
- hackmd.io https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor