Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M
CVE-2026-45284Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users to authenticate
Medium 4.6
In plain English
A medium-severity improper access control 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 0.2% (higher than 9% of all known vulnerabilities).
Severity (CVSS 3.1)4.6Medium
Exploit odds (30 days)0.2%top 90.9% 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. From version 1.3.6 to before version 8.4.0, an improper check allowed users that where provided by LDAP to still authenticate towards user OIDC after they where deleted. This issue has been patched in version 8.4.0.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | >= 1.3.6, < 8.4.0 |
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm x_refsource_CONFIRM
- https://github.com/nextcloud/user_oidc/pull/1340 x_refsource_MISC
- https://hackerone.com/reports/3554696 x_refsource_MISC