CVE-2025-66201Public exploitNetwork attack vector

Authenticated SSRF via mismatched OpenAPI domain validation

Published Nov 29, 2025 · Updated Dec 1, 2025

SSRF in LibreChat before 0.8.1-rc2 allows remote authenticated users to access server-reachable URLs through crafted Actions specs. The Actions route validates the client-supplied metadata.domain value but later builds requests from the unmatched raw_spec servers URL. Access to Actions is required; exploitation turns the server into a proxy for internal services and cloud metadata without interrupting LibreChat.

CVSS severity8.6
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in LibreChat before 0.8.1-rc2 allows remote authenticated users to access server-reachable URLs through crafted Actions specs. The Actions route validates the client-supplied metadata.domain value but later builds requests from the unmatched raw_spec servers URL. Access to Actions is required; exploitation turns the server into a proxy for internal services and cloud metadata without interrupting LibreChat.

The record

CVE
CVE-2025-66201
Published
Nov 29, 2025
Updated
Dec 1, 2025
Vendor
Danny Avila
Product
LibreChat
Classifications
CWE-20, CWE-918, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.8.1-rc2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Danny Avila · LibreChatversion=< 0.8.1-rc2

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
8.6GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-918Server-Side Request Forgery (SSRF)
T1552.005Unsecured Credentials: Cloud Instance Metadata API

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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