PostCSS has XSS via Unescaped </style> in its CSS Stringify Output

Description

No description available.

Recommendation

Update the postcss package to the latest compatible version. Followings are version details:

• Affected version(s): < 8.5.10
• Patched version(s): 8.5.10

References

• GHSA-qx2v-qp2m-jg93
• CVE-2026-41305
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• ApostropheCMS: Stored XSS via CSS Custom Property Injection in @apostrophecms/color-field Escaping Style Tag Context - CVE-2026-33889
• Cloudflare has SSRF via redirect following through its image-binding-transform endpoint (incomplete fix for GHSA-qpr4) - CVE-2026-41321
• Parse Server has a Cross-Site Scripting (XSS) vulnerability via Unescaped Mustache Template Variables - CVE-2025-68115
• Apostrophe has stored XSS via javascript: URL in Image Widget Link - CVE-2026-45011

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Tags:

npm

postcss