CVE-2026-45156— Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification in User OIDC
Possible ATT&CK Techniques 1AI
T1078 · Valid AccountsAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | >= 0.3.0, < 3.1.0 | affected |
>= 5.0.0, < 5.1.0 | affected | ||
>= 6.0.0, < 6.4.0 | affected |
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I. Basic Information for CVE-2026-45156
Vulnerability Information
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Vulnerability Title
Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification in User OIDC
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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 | >= 0.3.0, < 3.1.0 | - |
II. Public POCs for CVE-2026-45156
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-45156 (1)
Vendor Advisories for CVE-2026-45156 (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-2026-45722 | 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-2026-45282 | 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-2026-45275 | 6.5 MEDIUM | Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with |
| 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-2026-45691 | 5.9 MEDIUM | Nextcloud: Bypass of second factor authentication on DAV endpoints |
| 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-2026-45266 | 3.5 LOW | Nextcloud: Unauthorized force-mute from missing permission check when using internal signa |
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-2026-45691
Nextcloud: Bypass of second factor authentication on DAV end - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess - CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arb
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-2026-45691
Nextcloud: Bypass of second factor authentication on DAV end - CVE-2026-45690
Nextcloud: Two-Factor Authentication Bypass via Pending Sess - CVE-2026-45545
Nextcloud: SQL Injection in Column Type Parameter Allows Arb
Same weakness: CWE-287
- CVE-2026-10288
code-projects Hotel and Tourism Reservation System Admin Log - CVE-2026-45691
Nextcloud: Bypass of second factor authentication on DAV end - 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-2026-45153
Nextcloud: PIN bypass in PassCodeActivity via back button
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