Missing Permissions Check in Nextcloud Content Collaboration Platform
CVE-2026-45267

6.5MEDIUM

Key Information:

Vendor

Nextcloud
Status
Security-advisories
Vendor
CVE Published:
1 June 2026

What is CVE-2026-45267?

Nextcloud, an open-source content collaboration platform, was found to have a vulnerability that enabled unauthorized users to access the form submissions of other users due to a lack of permission checks. This issue has been addressed in version 5.2.6, ensuring that only authorized users can view form submissions, thereby securing user data from unauthorized access.

Affected Version(s)

security-advisories < 5.2.6

References

https://github.com/nextcloud/security-advisories/security...
x_refsource_CONFIRM
https://github.com/nextcloud/forms/pull/3269
x_refsource_MISC
https://hackerone.com/reports/3628817
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.