CVE-2026-121938
langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | moyangzhan |
| Product | langchain4j-aideepin |
| Published | Nov 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
moyangzhan / langchain4j-aideepin
0 < 3.31.0
References
github.com: https://github.com/moyangzhan/langchain4j-aideepin/issues/116 hackmd.io: https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor github.com: https://github.com/moyangzhan/langchain4j-aideepin/pull/117 github.com: https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93 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 vulncheck.com: https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid
Credits
hieuPenguinnn Matthew-james11