Vulnerability in moyangzhan langchain4j-aideepin

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/moyangzhan/langchain4j-aideepin/blob/v3.30.0/server/adi-common/src/main/java…
• github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93
• github.com/moyangzhan/langchain4j-aideepin/issues/116
• github.com/moyangzhan/langchain4j-aideepin/pull/117
• hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor
• www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-…
• hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cr…