CVE-2026-45267 PUBLISHED

Nextcloud: Missing permission check for from submissions

Assigner: GitHub_M
Reserved: 11.05.2026 Published: 01.06.2026 Updated: 01.06.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	nextcloud
Product	security-advisories
Versions	Version < 5.2.6 is affected

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

Problem Types

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