N/A

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-22254

CVE-2026-22254: Winter Affected by Stored Cross-Site Scripting (XSS) in Asset Manager

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Versions of Winter CMS before 1.2.10 allow users with access to the CMS Asset Manager were able to upload SVGs without automatic sanitization. To actively exploit this security issue, an attacker would need access to the Backend with a user account with the following permission: cms.manage_assets. The Winter CMS maintainers strongly recommend that the cms.manage_assets permission only be reserved to trusted administrators and developers in general. This vulnerability is fixed in 1.2.10.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-22254

CVE-2026-22254:

N/A

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
winter/wn-cms-module	composer	<= 1.2.9	1.2.10

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The security vulnerability is a stored Cross-site Scripting (XSS) issue in the Winter CMS Asset Manager. The root cause is the lack of input sanitization for SVG files during the upload process. The analysis of the provided patch commit, 8a7f74b004fcd19721764fc63af0cdb339d9fb65, clearly points to the onUpload function within the Cms\Widgets\AssetList class as the location of the vulnerability. The patch introduces a new code block that specifically checks if the uploaded file is an SVG (File::extension($fileName) === 'svg'). If it is, the file's content is sanitized using Svg::extract() before being saved. The absence of this sanitization step in the vulnerable versions allowed a malicious actor with cms.manage_assets permissions to upload a crafted SVG file, which would then execute arbitrary scripts in the browser of any user viewing that asset.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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