Bug 2483834 (CVE-2026-45691)
| Summary: | CVE-2026-45691 nextcloud-server: Nextcloud Server: Two-factor authentication bypass via session cookie reuse | ||
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| Product: | [Other] Security Response | Reporter: | Jon Moroney <jmoroney> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | Keywords: | Security |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in Nextcloud Server. An attacker could reuse a pre-two-factor authentication (2FA) session cookie as a Bearer token. This allows them to authenticate against DAV endpoints, granting unauthorized read and write access and bypassing the mandatory two-factor authentication.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 2483844, 2483851 | ||
| Bug Blocks: | |||
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Description
Jon Moroney
2026-06-01 21:45:57 UTC
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