CVE-2026-45267: Nextcloud Security-Advisories

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Nextcloud is an open source content collaboration platform. Prior to version 5.2.6, a missing permissions check allowed users to request reading form submissions of other users. This issue has been patched in version 5.2.6.

Affected products

• Nextcloud Security-Advisories: before 5.2.6 (fixed in 5.2.6)

Published 2026-06-01. Last modified 2026-07-22.