Vulnerability in vastxie 99AI

[ Why it matters ]Priority signals

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

[ Description ]Official description

99AI through 4.3.0 contains an insecure direct object reference vulnerability that allows unauthenticated attackers to read other users' chat messages because querySingleChat lacks an owner check. Attackers can send a fingerprint header to obtain a visitor JWT and iterate sequential chatId values to retrieve other users' message content and task data.

[ 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/vastxie/99AI
• github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts
• github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service.ts
• hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor
• www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-ch…