{"action":"Upgrade nextcloud-mcp-server to 0.117.2 or later.","affected":[{"fixed":"0.117.2","introduced":"0"}],"component":"nextcloud-mcp-server","cve_ids":["CVE-2026-55640"],"ecosystem":"PyPI","epss":0.0073,"exploited":false,"fixed_versions":["0.117.2"],"ghsa_id":"GHSA-8vh3-g2qg-2h2c","id":"tcs_01M5KH88QD61HFAWF0Z5K7HAVS","modified_at":"2026-09-10T12:15:18.811964337Z","published_at":"2026-09-10T09:44:56.031196Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3866","https://github.com/cbcoutinho/nextcloud-mcp-server/security/advisories/GHSA-8vh3-g2qg-2h2c","https://github.com/cbcoutinho/nextcloud-mcp-server/commit/4fc2b10945108cf1008ec9698291de6706ffcb73","https://github.com/cbcoutinho/nextcloud-mcp-server","https://github.com/cbcoutinho/nextcloud-mcp-server/tree/v0.117.2","https://pypi.org/project/nextcloud-mcp-server","https://github.com/advisories/GHSA-8vh3-g2qg-2h2c","https://nvd.nist.gov/vuln/detail/CVE-2026-55640"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-3866","url":"https://osv.dev/vulnerability/PYSEC-2026-3866"}],"summary":"nextcloud-mcp-server: Unauthenticated `POST /webhooks/nextcloud` allows arbitrary vector data deletion when `WEBHOOK_SECRET` is unset ( default )"}