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

Nextcloud MCP Server unauthenticated webhook endpoint allows index deletion

Nextcloud MCP Server prior to 0.117.2 has an unauthenticated webhook endpoint that allows attackers to delete or re-index vector embeddings for any user by sending forged deletion events, due to missing authentication when WEBHOOK_SECRET is unset.

Disclosed 25 August 2026 · Record updated 13 September 2026

Impact

Network attackers can delete or trigger re-indexing of vector embeddings for any user and destroy the semantic search index when WEBHOOK_SECRET is not configured

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-55640