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

> Unauthenticated attackers can read other users' chat messages and task data by exploiting an insecure direct object reference in the querySingleChat API.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-ghmq-xxc8-j8m5

## What is CVE-2026-111707?

CVE-2026-111707 is a medium-severity missing authorization vulnerability in vastxie 99AI, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-111707?


## How do I fix CVE-2026-111707?

No fix has been published for CVE-2026-111707 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111707 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111707 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111707 and fix it if it is affected.

What it is: CVE-2026-111707 is a medium-severity missing authorization vulnerability in vastxie 99AI, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111707 exists.

Affected product: vastxie 99AI. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-111707/ (Markdown: https://insights.sbomify.com/CVE-2026-111707/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111707
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111707
- OSV: https://osv.dev/vulnerability/CVE-2026-111707

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111707/
Summaries are generated and may contain mistakes; the official description above is the record.