CVE-2026-45278: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in nextcloud security-advisories
Nextcloud versions from 6. 1. 0 up to but not including 8. 2. 2 contain an open redirect vulnerability in the user OIDC login process. An attacker can craft a link that redirects users to an untrusted external website after login. This issue has been fixed in Nextcloud version 8. 2. 2. The vulnerability has a low severity rating and no known exploits in the wild have been reported.
AI Analysis
Technical Summary
CVE-2026-45278 is an open redirect vulnerability (CWE-601) affecting Nextcloud's security-advisories product versions 6.1.0 through before 8.2.2. The flaw allows attackers to create malicious links that redirect users to arbitrary external sites during the OIDC login flow. This could potentially be used in phishing or social engineering attacks to redirect users to untrusted domains. The vulnerability was patched in Nextcloud version 8.2.2. The CVSS v3.1 base score is 3.3, indicating low severity, with attack vector local, low complexity, no privileges required, user interaction required, and limited impact to integrity only.
Potential Impact
The impact is limited to integrity as the vulnerability allows redirection to untrusted sites, which could facilitate phishing or social engineering but does not directly compromise confidentiality or availability. There are no known exploits in the wild. The low CVSS score reflects the limited scope and impact of this vulnerability.
Mitigation Recommendations
This vulnerability is fixed in Nextcloud version 8.2.2. Users and administrators should upgrade to version 8.2.2 or later to remediate this issue. Since the vendor advisory does not specify any temporary or alternative mitigations, patching is the recommended course of action. No additional mitigation steps are indicated.
CVE-2026-45278: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in nextcloud security-advisories
Description
Nextcloud versions from 6. 1. 0 up to but not including 8. 2. 2 contain an open redirect vulnerability in the user OIDC login process. An attacker can craft a link that redirects users to an untrusted external website after login. This issue has been fixed in Nextcloud version 8. 2. 2. The vulnerability has a low severity rating and no known exploits in the wild have been reported.
CVSS v3.1
Score 3.3low
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-45278 is an open redirect vulnerability (CWE-601) affecting Nextcloud's security-advisories product versions 6.1.0 through before 8.2.2. The flaw allows attackers to create malicious links that redirect users to arbitrary external sites during the OIDC login flow. This could potentially be used in phishing or social engineering attacks to redirect users to untrusted domains. The vulnerability was patched in Nextcloud version 8.2.2. The CVSS v3.1 base score is 3.3, indicating low severity, with attack vector local, low complexity, no privileges required, user interaction required, and limited impact to integrity only.
Potential Impact
The impact is limited to integrity as the vulnerability allows redirection to untrusted sites, which could facilitate phishing or social engineering but does not directly compromise confidentiality or availability. There are no known exploits in the wild. The low CVSS score reflects the limited scope and impact of this vulnerability.
Mitigation Recommendations
This vulnerability is fixed in Nextcloud version 8.2.2. Users and administrators should upgrade to version 8.2.2 or later to remediate this issue. Since the vendor advisory does not specify any temporary or alternative mitigations, patching is the recommended course of action. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-11T18:41:13.157Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1de306e29bf47b503a5567
Added to database: 6/1/2026, 7:52:38 PM
Last enriched: 6/1/2026, 8:05:29 PM
Last updated: 6/2/2026, 6:21:28 AM
Views: 10
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