CVE-2026-45284

8.8 highEPSS 0.2%

High (8.8) in nextcloud user oidc. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-31)
CWE: CWE-284
Published: 2026-06-01
Modified: 2026-07-22
Record from: the NVD, synced 2026-10-19

Affected

nextcloud:user_oidc

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm
https://github.com/nextcloud/user_oidc/pull/1340
https://hackerone.com/reports/3554696

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