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Medium severity5.9NVD Advisory· Published Jun 1, 2026· Updated Jun 4, 2026

CVE-2026-45690

CVE-2026-45690

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

4
  • Nextcloud/Server3 versions
    cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*+ 2 more
    • cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*range: >=32.0.0,<32.0.9
    • cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*range: >=29.0.0,<29.0.16.16
    • (no CPE)range: >=32.0.0, <32.0.9, >=33.0.0, <33.0.3
  • osv-coords
    pkg:bitnami/nextcloud
    Range: >= 32.0.0, < 32.0.9

Patches

Vulnerability mechanics

References

3

News mentions

1