PT-2026-45528 · Nextcloud · Nextcloud

Dorra Jaouad · CVE-2026-45284 · Published 2026-06-01 · Updated 2026-07-22

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Nextcloud versions 1.3.6 through 8.3.x

Description An improper check in the authentication process allows users provided by LDAP to continue authenticating via user OIDC even after they have been deleted.

Recommendations Update to version 8.4.0.

Exploit

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-45284

GHSA-79XF-FFJ8-96FM

Affected Products

Nextcloud

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45284.json · Exploit
• https://github.com/nextcloud/user_oidc/pull/1340 · Patch
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-79xf-ffj8-96fm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45284 · Security Note
• https://osv.dev/vulnerability/CVE-2026-45284 · Vendor Advisory
• https://twitter.com/dailycve/status/2062368264768881124 · Twitter Post
• https://t.me/cveNotify/165866 · Telegram Post
• https://hackerone.com/reports/3554696 · Note
• https://t.me/cveNotify/211615 · Telegram Post