CVE-2026-45691

EUVD-2026-33718
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
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.9 MEDIUM
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 20%
Affected Products (NVD)
VendorProductVersion
nextcloudnextcloud_server
32.0.0 ≤
𝑥
< 32.0.9
nextcloudnextcloud_server
33.0.0 ≤
𝑥
< 33.0.3
nextcloudnextcloud_server
29.0.0 ≤
𝑥
< 29.0.16.16
nextcloudnextcloud_server
30.0.0 ≤
𝑥
< 30.0.17.9
nextcloudnextcloud_server
31.0.0 ≤
𝑥
< 31.0.14.5
nextcloudnextcloud_server
32.0.0 ≤
𝑥
< 32.0.9
nextcloudnextcloud_server
33.0.0 ≤
𝑥
< 33.0.3
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mp6x-g55j-w9jw
https://github.com/nextcloud/server/pull/59758
https://hackerone.com/reports/3573399