CVE-2025-66201: librechat Input Validation Flaw

Description

LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.1-rc2, LibreChat is vulnerable to Server-side Request Forgery (SSRF), by passing specially crafted OpenAPI specs to its "Actions" feature and making the LLM use those actions. It could be used by an authenticated user with access to this feature to access URLs only accessible to the LibreChat server (such as cloud metadata services, through which impersonation of the server might be possible). This issue has been patched in version 0.8.1-rc2.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-20 Improper Input Validation

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
librechat	librechat	< 0.8.1
librechat	librechat	All
librechat	librechat	All

References

Advisories & Patches

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-7m2q-fjwr-5x8v https://github.com/danny-avila/LibreChat/security/advisories/GHSA-7m2q-fjwr-5x8v

Exploits

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-7m2q-fjwr-5x8v https://github.com/danny-avila/LibreChat/security/advisories/GHSA-7m2q-fjwr-5x8v

Frequently Asked Questions

What is CVE-2025-66201? +

LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.1-rc2, LibreChat is vulnerable to Server-side Request Forgery (SSRF), by passing specially crafted OpenAPI specs to its "Actions" feature and making the LLM use those actions. It could be used by an authenticated user with access to this feature to access URLs only accessible to the LibreChat server (such as cloud metadata services, through which impersonation of the server might be possible). This issue has been patched in version 0.8.1-rc2. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-66201? +

CVE-2025-66201 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-66201? +

CVE-2025-66201 affects products from librechat, specifically: librechat. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66201? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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