What is CVE-2026-54033?

CVE-2026-54033 is a high-severity vulnerability in Danny-Avila Librechat, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-06-25.

How severe is CVE-2026-54033?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Danny-Avila Librechat

CVE-2026-54033

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, LibreChat allows users to configure custom OpenAI-compatible API endpoints by setting a baseURL. This URL is used to construct HTTP requests without any SSRF validation — no private IP check, no scheme restriction, no DNS pinning. An authenticated user can set baseURL to internal network addresses. This vulnerability is fixed in 0.8.4-rc1.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-06-25 · last modified 2026-06-29.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Danny-Avila Librechat — versions < 0.8.4-rc1
Librechat

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/danny-avila/LibreChat/security/advisories/GHSA-gc9r-88c3-7qhq (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-54033?: CVE-2026-54033 is a high-severity vulnerability in Danny-Avila Librechat, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-06-25.
How severe is CVE-2026-54033?: High severity. CVSS v3 base score is 7.7 out of 10.