CVE-2026-121938 langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121938?
CVE-2026-121938 is a medium-severity vulnerability in moyangzhan langchain4j-aideepin, published on 4 Nov 2026.
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-121938?
How do I fix CVE-2026-121938?
No fix has been published for CVE-2026-121938 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121938 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121938 exists.
Sources
Also known as GHSA-j5gc-wvrm-78hc.