Wn backend module: Winter: Stored XSS through Editor Settings custom styles (CVE-2026-32258)
Winter CMS backend module versions 1.2.10 through 1.2.12 have a stored cross-site scripting (XSS) vulnerability in the Editor Settings custom styles feature. Authenticated backend users with the 'backend.manage_editor' permission can inject malicious code via custom styles that are compiled and rendered without proper sanitization. This vulnerability is patched in version 1.2.13.
AI Analysis
Technical Summary
The Winter CMS backend module (wn-backend-module) versions 1.2.10 to 1.2.12 contain a stored XSS vulnerability (CVE-2026-32258) in the Editor Settings custom styles feature. Authenticated users with elevated permissions ('backend.manage_editor') can inject malicious code through custom CSS styles that are compiled and rendered without proper sanitization. This vulnerability has a CVSS 3.1 score of 8.1, indicating high severity. The issue is fixed in version 1.2.13 by applying sanitization to the compiled CSS output.
Potential Impact
Successful exploitation allows an authenticated backend user with specific elevated permissions to execute arbitrary script code in the context of the backend application, potentially leading to compromise of confidentiality and integrity of the backend session or data. There is no impact on availability. The vulnerability requires elevated privileges and user interaction (authenticated user).
Mitigation Recommendations
A patch is available in Winter CMS backend module version 1.2.13 that applies proper sanitization to the compiled CSS output, mitigating the stored XSS vulnerability. Users should upgrade to version 1.2.13 or later to remediate this issue.
Wn backend module: Winter: Stored XSS through Editor Settings custom styles (CVE-2026-32258)
Description
Winter CMS backend module versions 1.2.10 through 1.2.12 have a stored cross-site scripting (XSS) vulnerability in the Editor Settings custom styles feature. Authenticated backend users with the 'backend.manage_editor' permission can inject malicious code via custom styles that are compiled and rendered without proper sanitization. This vulnerability is patched in version 1.2.13.
CVSS v3.1
Score 8.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Winter CMS backend module (wn-backend-module) versions 1.2.10 to 1.2.12 contain a stored XSS vulnerability (CVE-2026-32258) in the Editor Settings custom styles feature. Authenticated users with elevated permissions ('backend.manage_editor') can inject malicious code through custom CSS styles that are compiled and rendered without proper sanitization. This vulnerability has a CVSS 3.1 score of 8.1, indicating high severity. The issue is fixed in version 1.2.13 by applying sanitization to the compiled CSS output.
Potential Impact
Successful exploitation allows an authenticated backend user with specific elevated permissions to execute arbitrary script code in the context of the backend application, potentially leading to compromise of confidentiality and integrity of the backend session or data. There is no impact on availability. The vulnerability requires elevated privileges and user interaction (authenticated user).
Mitigation Recommendations
A patch is available in Winter CMS backend module version 1.2.13 that applies proper sanitization to the compiled CSS output, mitigating the stored XSS vulnerability. Users should upgrade to version 1.2.13 or later to remediate this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vgp4-2fc4-qff2
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-32258"]
- Ecosystems
- ["Packagist"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7c9b39bf8831d539cdc770
Added to database: 08/12/2026, 16:11:37 UTC
Last enriched: 09/12/2026, 05:33:07 UTC
Last updated: 09/25/2026, 13:47:44 UTC
Views: 58
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