CVE-2026-82982: Nextcloud Approval

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The Approval app's approve/reject endpoint is meant to require the file's current etag as a freshness check, preventing an approver from approving or rejecting a file whose contents changed after they reviewed it. The backend only enforced this check when the etag parameter was present and non-empty in the request. An attacker able to intercept and modify the approval request could omit the etag field entirely, bypassing the freshness check and approving or rejecting a file version they never reviewed.

Affected products

• Nextcloud Approval: from 1.0.0, up to and including 3.0.0

Published 2026-09-18. Last modified 2026-09-18.