nextcloud-mcp-server: Unauthenticated `POST /webhooks/nextcloud` allows arbitrary vector data deletion when `WEBHOOK_...

Date Aug 25, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · nextcloud-mcp-server

CVE CVE-2026-55640

High-risk advisory CVE-2026-55640

Summary

nextcloud-mcp-server: Unauthenticated `POST /webhooks/nextcloud` allows arbitrary vector data deletion when `WEBHOOK_SECRET` is unset ( default )

Why it matters

GitHub has published a reviewed security advisory for nextcloud-mcp-server. Prioritize it with other application dependency updates.

Operator check

Check whether nextcloud-mcp-server is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-8vh3-g2qg-2h2c NVD — CVE-2026-55640 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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