CVE-2026-45267Nextcloud: Missing permission check for from submissions

Description

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r4gh-f8x6-m55f
• https://github.com/nextcloud/forms/pull/3269
• https://hackerone.com/reports/3628817