CVE-2026-45691 Details
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
A vulnerability exists in Nextcloud Server versions 32.0.0 prior to 32.0.9 and 33.0.0 prior to 33.0.3, as well as in Nextcloud Enterprise Server versions 29.0.0 through 29.0.16.16, 30.0.0 through 30.0.17.9, 31.0.0 through 31.0.14.5, 32.0.0 prior to 32.0.9, and 33.0.0 prior to 33.0.3. The issue arises from a pre-two-factor authentication session cookie, which can be reused as a Bearer token to authenticate against DAV endpoints. This reuse grants read/write access while bypassing mandatory two-factor authentication requirements.
Users are advised to upgrade Nextcloud Server to version 33.0.3 or 32.0.9. Nextcloud Enterprise Server users should upgrade to version 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, or 29.0.16.16.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 1, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mp6x-g55j-w9jw | [email protected] | Vendor Advisory |
| https://github.com/nextcloud/server/pull/59758 | [email protected] | Issue TrackingPatch |
| https://hackerone.com/reports/3573399 | [email protected] | Permissions Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nextcloud nextcloud server | >= 32.0.0, < 32.0.9 >= 33.0.0, < 33.0.3 >= 29.0.0, < 29.0.16.16 >= 30.0.0, < 30.0.17.9 >= 31.0.0, < 31.0.14.5 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 4, 2026 | Initial Analysis | [email protected] |
| Jun 1, 2026 | New CVE Received | [email protected] |