Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M
CVE-2026-45267Nextcloud: Missing permission check for from submissions
Medium 6.5
In plain English
A medium-severity information exposure in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 78.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | < 5.2.6 |
Weakness: CWE-200, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r4gh-f8x6-m55f x_refsource_CONFIRM
- https://github.com/nextcloud/forms/pull/3269 x_refsource_MISC
- https://hackerone.com/reports/3628817 x_refsource_MISC