CVE-2026-45278— Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass
Possible ATT&CK Techniques 1AI
T1566.002 · Spearphishing LinkAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | >= 6.1.0, < 8.2.2 | affected |
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I. Basic Information for CVE-2026-45278
Vulnerability Information
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Vulnerability Title
Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nextcloud is an open source content collaboration platform. From version 6.1.0 to before version 8.2.2, an attacker can craft links that would redirect users to another website, when the victim uses the attackers link to log in via user OIDC. This issue has been patched in version 8.2.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nextcloud | security-advisories | >= 6.1.0, < 8.2.2 | - |
II. Public POCs for CVE-2026-45278
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-45278 (1)
Vendor Advisories for CVE-2026-45278 (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-2026-45156 | 8.1 HIGH | Nextcloud: Authentication Bypass in ID4me handling via Missing JWT Signature Verification |
| 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-2026-45267 | 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-2026-45282 | 6.5 MEDIUM | Nextcloud: Logged-in user bypasses share password and download restrictions on Text attach |
| CVE-2026-45285 | 6.4 MEDIUM | Nextcloud: Hidden Public Link creation when sharing to a Team External Member |
| CVE-2026-45157 | 6.3 MEDIUM | Nextcloud: Valid share tokens allow to access tempory upload files of share owner |
| CVE-2026-45283 | 6.3 MEDIUM | Nextcloud: Files Lock app allows users to lock and unlock files of other users |
| 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-2026-45544 | 4.3 MEDIUM | Nextcloud: Information Disclosure of view filter metdata via Broken Sensitive Data Masking |
| CVE-2026-45286 | 4.3 MEDIUM | Nextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint |
| CVE-2026-45264 | 4.3 MEDIUM | Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: security-advisories
- CVE-2026-24754
Kiteworks Secure Data Forms Vulnerable to Cross-site Scripti - 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
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-601
- CVE-2026-40961
Apache Airflow: Open Redirect Bypass Vulnerability - CVE-2026-49380
TeamCity <2026.1 SAML插件存在开放重定向漏洞 - CVE-2026-45307
Speakr: Open redirect in is_safe_url via parser mismatch on - CVE-2026-44681
Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Autho - CVE-2026-45335
WeGIA: Middleware whitelist bypass → open redirect via Inter
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