CVE-2025-66201

HIGH

LibreChat < 0.8.1-rc2 - Authenticated Server-Side Request Forgery via Actions Feature

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 8.1
EPSS 0.0025
EPSS Percentile 15.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-20 CWE-918
Status published
Products (2)
librechat/librechat 0.8.1 (2 CPE variants)
librechat/librechat < 0.8.1
Published Nov 29, 2025
Tracked Since Feb 18, 2026