Auth bypass in Chatchat-Space Langchain-Chatchat
CVE-2026-7844
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (39.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Chatchat-Space Langchain-Chatchat — versions 0.3.1.0, 0.3.1.1, 0.3.1.2
Weakness classification (CWE)
References
- github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-4-Missing-Auth-File-… (exploit)
- github.com/chatchat-space/Langchain-Chatchat/ (product)
- github.com/chatchat-space/Langchain-Chatchat/issues/5465 (issue-tracking)
- vuldb.com/submit/807790 (third-party-advisory)
- vuldb.com/vuln/361123 (technical-description, vdb-entry)
- vuldb.com/vuln/361123/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-7844?
- CVE-2026-7844 is a medium-severity vulnerability in Chatchat-Space Langchain-Chatchat, classified under Improper Authentication. CVSS score: 6.3/10. Published 2026-05-05.
- How severe is CVE-2026-7844?
- Medium severity. CVSS v3 base score is 6.3 out of 10.