Vulnerability in Nextcloud (CVE-2025-66545)
Summary
Vulnerability in Nextcloud (CVE-2025-66545). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 14.0.11 or later.
Original description
The description as published by the source.
Nextcloud Groupfolders provides admin-configured folders shared by everyone in a group or team. Prior to 14.0.11, 15.3.12, 16.0.15, 17.0.14, 18.1.8, 19.1.8, and 20.1.2, a user with read-only permission can restore a file from the trash bin. This vulnerability is fixed in 14.0.11, 15.3.12, 16.0.15, 17.0.14, 18.1.8, 19.1.8, and 20.1.2.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-66545 has been found in Nextcloud.
Risk of unauthorized operations or information disclosure. CVSS score: 3.5/10.
What to do: upgrade Nextcloud to 14.0.11 or later.
If unsure, ask your IT team or search "Nextcloud CVE-2025-66545" on the vendor's site.
CVE-2025-66545 (Nextcloud) — CWE-707 / CVSS v3 3.5
Attack vector: remote (network-reachable)
Patched: 14.0.11 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-707) exists in Nextcloud.
Check the vendor advisory for the affected versions of Nextcloud.
Severity: Low (CVSS 3.5/10). Risk of unauthorized operations or information disclosure.
Update to 14.0.11.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Nextcloud' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Nextcloud' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Nextcloudを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade Nextcloud to 14.0.11ステージング環境で 14.0.11 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。