CVE-2026-45690

5.9 MEDIUM

Nextcloud is an open source content collaboration platform

Published: 2026-06-01 · Last updated: 2026-06-04

Severity and scoring

CVSS: 5.9 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
CWE: CWE-287

Affected products

Vendor	Product
nextcloud	nextcloud_server

Description

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

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-45690
[Vendor advisory]https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922
[Patch]https://github.com/nextcloud/server/pull/59758
[Other]https://hackerone.com/reports/3639301

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CVE-2026-45810 — Nextcloud is an open source content collaboration platform (6.8 MEDIUM)
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CVE-2026-45545 — Nextcloud is an open source content collaboration platform (8.2 HIGH)
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