5.9

CVE-2026-45690

Nextcloud: Two-Factor Authentication Bypass via Pending Session Token Replay

Two-Factor Authentication Bypass via Pending Session Token Replay

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authentication bypass vulnerability allowed attackers with knowledge of a user's password to circumvent two-factor authentication (2FA) protections. When a user initiated login with valid credentials on a 2FA-enabled account, the system created a temporary session token before enforcing the second factor challenge. This token could be extracted and replayed via HTTP Basic Authentication to gain unauthorized access to authenticated endpoints. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9 or 29.0.16.16
Mögliche Gegenmaßnahme
Server: * No workaround available
Enterprise Server: * No workaround available
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Nextcloud ≫ Nextcloud Server SwEdition- Version >= 32.0.0 < 32.0.9
Nextcloud ≫ Nextcloud Server SwEdition- Version >= 33.0.0 < 33.0.3
Nextcloud ≫ Nextcloud Server SwEditionenterprise Version >= 29.0.0 < 29.0.16.16
Nextcloud ≫ Nextcloud Server SwEditionenterprise Version >= 30.0.0 < 30.0.17.9
Nextcloud ≫ Nextcloud Server SwEditionenterprise Version >= 31.0.0 < 31.0.14.5
Nextcloud ≫ Nextcloud Server SwEditionenterprise Version >= 32.0.0 < 32.0.9
Nextcloud ≫ Nextcloud Server SwEditionenterprise Version >= 33.0.0 < 33.0.3
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Weitere Schwachstelleninformationen
SystemNextcloud
≫
Produkt Server
Version >= 32.0.0, < 32.0.9
Version >= 33.0.0, < 33.0.3
SystemNextcloud
≫
Produkt Enterprise Server
Version >= 29.0.0, < 29.0.16.16
Version >= 30.0.0, < 30.0.17.9
Version >= 31.0.0, < 31.0.14.5
Version >= 32.0.0, < 32.0.9
Version >= 33.0.0, < 33.0.3
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.204
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 5.9 1.6 4.2
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
CWE-287 Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922
Vendor Advisory
https://github.com/nextcloud/server/pull/59758
Patch
Issue Tracking
https://hackerone.com/reports/3639301
Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922
Third Party Advisory