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    CVE-2026-41305

    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.

    Published:Apr 24, 2026
    Last Modified:Apr 27, 2026
    EPS:Apr 24, 2026
    EPSS Score:0.00029
    CVSS Score:6.1

    Affected Products

    Vendor
    Postcss
    Product
    Postcss

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-45623 (CVSS 7.5) — PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an…
    CVE-2026-9358 (CVSS 2.1) — A vulnerability was determined in postcss-selector-parser up to 6.1.2/7.1.2. Affected is the function toString…
    CVE-2023-44270 (CVSS 5.3) — An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse ext…
    CVE-2021-23382 (CVSS 5.3) — The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnota…
    CVE-2021-23368 (CVSS 5.3) — The package postcss from 7.0.0 and before 8.2.10 are vulnerable to Regular Expression Denial of Service (ReDoS…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High