CVE-2026-45691

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, 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

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-45691
[Vendor advisory]https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mp6x-g55j-w9jw
[Patch]https://github.com/nextcloud/server/pull/59758
[Other]https://hackerone.com/reports/3573399

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CVE-2026-45810 — Nextcloud is an open source content collaboration platform (6.8 MEDIUM)
CVE-2026-45722 — Nextcloud is an open source content collaboration platform (7.1 HIGH)
CVE-2026-45690 — Nextcloud is an open source content collaboration platform (5.9 MEDIUM)
CVE-2026-45545 — Nextcloud is an open source content collaboration platform (8.2 HIGH)
CVE-2026-45544 — Nextcloud is an open source content collaboration platform (4.3 MEDIUM)

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