CVE-2026-41305 (Medium) detected in postcss-7.0.35.tgz

[mend-bolt-for-github]

CVE-2026-41305 - Medium Severity Vulnerability

Vulnerable Library - postcss-7.0.35.tgz

Tool for transforming styles with JS plugins

Library home page: https://registry.npmjs.org/postcss/-/postcss-7.0.35.tgz

Path to dependency file: /day60/package.json

Path to vulnerable library: /day60/package.json,/day59/package.json

Dependency Hierarchy:

• gulp-autoprefixer-7.0.1.tgz (Root Library)
  • ❌ postcss-7.0.35.tgz (Vulnerable Library)

Found in HEAD commit: c88b9429eb68a85b22f0e39cac7bf20b89cb6709

Found in base branch: master

Vulnerability Details

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Versions prior to 8.5.10 do not escape "</style>" sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML "<style>" tags, "</style>" in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.

Publish Date: 2026-04-24

URL: CVE-2026-41305

CVSS 3 Score Details (6.1)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-qx2v-qp2m-jg93

Release Date: 2026-04-24

Fix Resolution: postcss - 8.5.10,https://github.com/postcss/postcss.git - 8.5.10

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