5.9

CVE-2026-45691

Nextcloud: Bypass of second factor authentication on DAV endpoints

Bypass of second factor authentication on DAV endpoints by reusing a pre-2FA session ID

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, a pre-2FA session cookie (created after successful password authentication but before TOTP completion) could be reused as a Bearer token to authenticate against DAV endpoints, granting read/write access and bypassing mandatory two-factor authentication. 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
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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-mp6x-g55j-w9jw
Vendor Advisory
https://github.com/nextcloud/server/pull/59758
Patch
Issue Tracking
https://hackerone.com/reports/3573399
Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mp6x-g55j-w9jw
Third Party Advisory