CVE-2026-45267

Nextcloud: Missing permission check for from submissions

State: Published
Severity: 6.5 Medium
Published: Jun 1, 2026
Updated: Jun 1, 2026
Reserved: May 11, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-862 Missing Authorization

Affected Products

Product	Versions
security-advisoriesnextcloud	< 5.2.6Affected

References

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

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