Vulnerability details
CVE-2026-54030
danny-avila LibreChat
LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
CVSS 3.1
8.0High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.0High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| danny-avila | LibreChat | < 0.8.5 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23 x_refsource_CONFIRM
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Details
- Published
- 2026-06-25
- Last updated
- 2026-06-26
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.16%
Probability of exploitation in 30 days
6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-346Origin Validation Error