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VulnerabilityPublished

CVE-2026-54030: danny-avila LibreChat · Origin Validation Error

Affects danny-avila LibreChatSource CVE Database V5

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Not known to be exploited · CVSS 8.0 High : upgrade to 0.8.5 soon.

Data as of 8 Nov 2026, 23:24 UTC

CVSS 3.1 base score
8.0High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.8.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade LibreChat and danny-avila/LibreChat to 0.8.5.

Affected software

ProductAffectedFixed in
danny-avilaLibreChatAffected
  • <0.8.5
Fixed in
  • 0.8.5
GitHubdanny-avila/LibreChatpkg:github/danny-avila/LibreChatOther threatsAffected
  • <0.8.5
Fixed in
  • 0.8.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade LibreChat to version 0.8.5 or later, where this vulnerability is fixed. Patch status is confirmed by the vendor stating the issue is resolved in 0.8.5. No other mitigations are specified.

Description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.

References

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