# CVE-2026-7844: chatchat-space Langchain-Chatchat Compatible File Service openai_routes.py delete_file missing authentication

> Attackers on the local network can access and delete files in Langchain-Chatchat due to missing authentication in the Compatible File Service.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 May 2026
- **Updated:** 6 May 2026
- **Also known as:** GHSA-xvqj-p4jj-r7xh

## What is CVE-2026-7844?

CVE-2026-7844 is a medium-severity missing authorization vulnerability in chatchat-space Langchain-Chatchat, published on 5 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was detected in chatchat-space Langchain-Chatchat up to 0.3.1.3. This vulnerability affects the function files/list_files/retrieve_file/retrieve_file_content/delete_file of the file libs/chatchat-server/chatchat/server/api_server/openai_routes.py of the component Compatible File Service. The manipulation results in missing authentication. The attacker must have access to the local network to execute the attack. The exploit is now public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-306 (Missing Authentication for Critical Functionality), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-7844?


## How do I fix CVE-2026-7844?

No fix has been published for CVE-2026-7844 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7844 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7844 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7844 and fix it if it is affected.

What it is: CVE-2026-7844 is a medium-severity missing authorization vulnerability in chatchat-space Langchain-Chatchat, published on 5 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7844 exists.

Affected product: chatchat-space Langchain-Chatchat. 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-2026-7844/ (Markdown: https://insights.sbomify.com/CVE-2026-7844/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7844
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7844
- OSV: https://osv.dev/vulnerability/CVE-2026-7844

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7844/
Summaries are generated and may contain mistakes; the official description above is the record.