What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-200

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.

Affected products

• nextcloud security-advisories: before 5.2.6

References

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

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