Vulnerability Details CVE-2026-54030
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.5%
CVSS Severity
CVSS v3 Score 8.0
References
Products affected by CVE-2026-54030
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cpe:2.3:a:librechat:librechat:-
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cpe:2.3:a:librechat:librechat:0.0.1
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cpe:2.3:a:librechat:librechat:0.0.2
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cpe:2.3:a:librechat:librechat:0.0.3
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cpe:2.3:a:librechat:librechat:0.0.4
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cpe:2.3:a:librechat:librechat:0.0.5
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cpe:2.3:a:librechat:librechat:0.0.6
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cpe:2.3:a:librechat:librechat:0.1.0
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cpe:2.3:a:librechat:librechat:0.1.1
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cpe:2.3:a:librechat:librechat:0.2.0
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cpe:2.3:a:librechat:librechat:0.3.0
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cpe:2.3:a:librechat:librechat:0.3.3
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cpe:2.3:a:librechat:librechat:0.4.0
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cpe:2.3:a:librechat:librechat:0.4.1
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cpe:2.3:a:librechat:librechat:0.4.2
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cpe:2.3:a:librechat:librechat:0.4.3
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cpe:2.3:a:librechat:librechat:0.4.4
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cpe:2.3:a:librechat:librechat:0.4.5
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cpe:2.3:a:librechat:librechat:0.4.6
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cpe:2.3:a:librechat:librechat:0.4.7
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cpe:2.3:a:librechat:librechat:0.4.8
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cpe:2.3:a:librechat:librechat:0.5.0
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cpe:2.3:a:librechat:librechat:0.5.1
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cpe:2.3:a:librechat:librechat:0.5.2
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cpe:2.3:a:librechat:librechat:0.5.3
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cpe:2.3:a:librechat:librechat:0.5.4
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cpe:2.3:a:librechat:librechat:0.5.5
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cpe:2.3:a:librechat:librechat:0.5.6
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cpe:2.3:a:librechat:librechat:0.5.7
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cpe:2.3:a:librechat:librechat:0.5.8
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cpe:2.3:a:librechat:librechat:0.5.9
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cpe:2.3:a:librechat:librechat:0.6.0
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cpe:2.3:a:librechat:librechat:0.6.1
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cpe:2.3:a:librechat:librechat:0.6.10
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cpe:2.3:a:librechat:librechat:0.6.5
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cpe:2.3:a:librechat:librechat:0.6.6
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cpe:2.3:a:librechat:librechat:0.6.9
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cpe:2.3:a:librechat:librechat:0.7.0
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cpe:2.3:a:librechat:librechat:0.7.1
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cpe:2.3:a:librechat:librechat:0.7.2
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cpe:2.3:a:librechat:librechat:0.7.3
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cpe:2.3:a:librechat:librechat:0.7.4
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cpe:2.3:a:librechat:librechat:0.7.5
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cpe:2.3:a:librechat:librechat:0.7.6
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cpe:2.3:a:librechat:librechat:0.7.7
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cpe:2.3:a:librechat:librechat:0.7.8
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cpe:2.3:a:librechat:librechat:0.7.9
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cpe:2.3:a:librechat:librechat:0.8.0
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cpe:2.3:a:librechat:librechat:0.8.1
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cpe:2.3:a:librechat:librechat:0.8.2
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cpe:2.3:a:librechat:librechat:0.8.3
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cpe:2.3:a:librechat:librechat:0.8.5