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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

LibreChat: agent file-upload authorization bypass and MCP OAuth token theft flaws

Two vulnerabilities were disclosed in LibreChat: CVE-2026-54027, where the POST /api/files/images endpoint let any authenticated user upload files into any agent's tool_resources without ownership or EDIT permission checks, and CVE-2026-54030, where the MCP OAuth implementation failed to validate the RFC 9728 resource parameter against the configured MCP server URL, allowing a malicious MCP server to steal access tokens. Both are fixed in versions 0.8.4-rc1 and 0.8.5 respectively.

Disclosed 25 June 2026 · Record updated 13 September 2026

Impact

Authenticated users could inject files into other users' agent tool resources (including context and execute_code), and a malicious MCP server could capture OAuth access tokens intended for a legitimate server.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-54027
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-54030