Threats Tagged 'cve-2026-55640'
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Threats Tagged 'cve-2026-55640'
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CVE-2026-55640: CWE-306: Missing Authentication for Critical Function in cbcoutinho nextcloud-mcp-serverCVE-2026-55640 0 Nextcloud MCP Server is a production-ready MCP server that connects AI assistants to a Nextcloud instance. Prior to 0.117.2, the POST /webhooks/nextcloud endpoint in nextcloud_mcp_server/vector/webhook_receiver.py has no authentication by default because WEBHOOK_SECRET defaults to None and startup validation does not require it. When WEBHOOK_SECRET is unset, handle_nextcloud_webhook() accepts unauthenticated requests. The payload["user"]["uid"] field parsed in nextcloud_mcp_server/vector/webhook_parser.py is attacker-controlled and is used without an authenticated-session cross-check for Qdrant operations, allowing a network attacker to delete or trigger re-indexing of vector embeddings for any user and to destroy the semantic search index by sending forged deletion events. This issue is fixed in version 0.117.2. Join the discussion | CVE Database V5 | 08/25/2026, 16:03:28 UTC Added: 08/25/2026, 16:08:01 UTC |
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