How severe is CVE-2025-66201?

CVE-2025-66201 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-66201 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66201?

CVE-2025-66201 primarily affects Librechat. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-66201?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-66201 have an EU (EUVD) identifier?

Yes. CVE-2025-66201 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199888.

When was CVE-2025-66201 published?

CVE-2025-66201 was published on 2025-11-29 and last updated on 2026-06-17.

CVE-2025-66201

CVE-2025-66201 is a high-severity vulnerability in Librechat with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 8.6
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199888
Weakness: CWE-918
Affected product: Librechat
Published: 2025-11-29
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-66201?: CVE-2025-66201 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-66201 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66201?: CVE-2025-66201 primarily affects Librechat. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-66201?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66201 have an EU (EUVD) identifier?: Yes. CVE-2025-66201 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199888.
When was CVE-2025-66201 published?: CVE-2025-66201 was published on 2025-11-29 and last updated on 2026-06-17.

References

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

Affected products (3)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*
cpe:2.3:a:librechat:librechat:0.8.1:-:*:*:*:*:*:*
cpe:2.3:a:librechat:librechat:0.8.1:rc1:*:*:*:*:*:*

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