CVE-2026-45691— Nextcloud: Bypass of second factor authentication on DAV endpoints
Affected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | >= 32.0.0, < 32.0.9 | affected |
>= 33.0.0, < 33.0.3 | affected |
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I. Basic Information for CVE-2026-45691
Vulnerability Information
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Vulnerability Title
Nextcloud: Bypass of second factor authentication on DAV endpoints
Source: NVD (National Vulnerability Database)
Vulnerability 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 (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nextcloud | security-advisories | >= 32.0.0, < 32.0.9 | - |
II. Public POCs for CVE-2026-45691
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-45691 (1)
Vendor Advisories for CVE-2026-45691 (1)
Same Patch Batch · nextcloud · 2026-06-01 · 26 CVEs total
| CVE-2026-45545 | 8.2 HIGH | Nextcloud: SQL Injection in Column Type Parameter Allows Arbitrary SQL Execution |
| CVE-2026-45281 | 8.1 HIGH | Nextcloud: Cross-Account Calendar Takeover via Unauthorized Group-Member-Set Update |
| CVE-2026-45156 | 8.1 HIGH | Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification |
| CVE-2026-45722 | 7.1 HIGH | Nextcloud: Tables app allows limited SQLi in ORDER BY with malicious sort order argument f |
| CVE-2026-45810 | 6.8 MEDIUM | Nextcloud: Propfind requests for file comments allowed to load comments for other files |
| CVE-2026-45275 | 6.5 MEDIUM | Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with |
| CVE-2026-45282 | 6.5 MEDIUM | Nextcloud: Logged-in user bypasses share password and download restrictions on Text attach |
| CVE-2026-45267 | 6.5 MEDIUM | Nextcloud: Missing permission check for from submissions |
| CVE-2026-45285 | 6.4 MEDIUM | Nextcloud: Hidden Public Link creation when sharing to a Team External Member |
| CVE-2026-45283 | 6.3 MEDIUM | Nextcloud: Files Lock app allows users to lock and unlock files of other users |
| CVE-2026-45157 | 6.3 MEDIUM | Nextcloud: Valid share tokens allow to access tempory upload files of share owner |
| CVE-2026-45690 | 5.9 MEDIUM | Nextcloud: Two-Factor Authentication Bypass via Pending Session Token Replay |
| CVE-2026-45543 | 5.3 MEDIUM | Nextcloud: Deleting a Forms collaborator share leaves uploaded response files accessible t |
| CVE-2026-45153 | 4.6 MEDIUM | Nextcloud: PIN bypass in PassCodeActivity via back button |
| CVE-2026-45284 | 4.6 MEDIUM | Nextcloud: Wrong condition in the User OIDC app's LdapService allowed deleted LDAP users t |
| CVE-2026-45279 | 4.4 MEDIUM | Nextcloud: Limited path traversal via template API if using `{lang}` in config |
| CVE-2026-45264 | 4.3 MEDIUM | Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames |
| CVE-2026-45286 | 4.3 MEDIUM | Nextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint |
| CVE-2026-45544 | 4.3 MEDIUM | Nextcloud: Information Disclosure of view filter metdata via Broken Sensitive Data Masking |
| CVE-2026-45159 | 3.5 LOW | Nextcloud: Files drop share links for end-to-end encrypted folders allowed to drop files i |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: security-advisories
- CVE-2026-45810
Nextcloud: Propfind requests for file comments allowed to lo - CVE-2026-45722
Nextcloud: Tables app allows limited SQLi in ORDER BY with m - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess - CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arb - CVE-2026-45544
Nextcloud: Information Disclosure of view filter metdata via
Same vendor: nextcloud
- CVE-2026-45810
Nextcloud: Propfind requests for file comments allowed to lo - CVE-2026-45722
Nextcloud: Tables app allows limited SQLi in ORDER BY with m - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess - CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arb - CVE-2026-45544
Nextcloud: Information Disclosure of view filter metdata via
Same weakness: CWE-287
- CVE-2026-40964
Cloud Foundry log-cache身份绕过漏洞 - CVE-2026-10288
code-projects Hotel and Tourism Reservation System Admin Log - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess - CVE-2026-45283
Nextcloud: Files Lock app allows users to lock and unlock fi - CVE-2026-45156
Nextcloud: Authentication Bypass in ID4me handling via Missi
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