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    10 vulnerabilities by postcss

    CVE-2026-45623 (GCVE-0-2026-45623)

    Vulnerability from nvd – Published: 2026-07-27 17:23 – Updated: 2026-07-27 17:44
    VLAI
    Title
    PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments
    Summary
    PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*# sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file readable by Node and leak the first ~10 bytes of its content through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is triggered with PostCSS's default options — no from, no map, no plugins required — and is therefore reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles, browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers, etc.). This issue has been fixed in version 8.5.12.
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
    Assigner
    References
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.12
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-41305 (GCVE-0-2026-41305)

    Vulnerability from nvd – Published: 2026-04-24 02:27 – Updated: 2026-04-24 16:23
    VLAI
    Title
    PostCSS has XSS via Unescaped </style> in its CSS Stringify Output
    Summary
    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.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.10
    Create a notification for this product.
    Show details on NVD website

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    CVE-2023-44270 (GCVE-0-2023-44270)

    Vulnerability from nvd – Published: 2023-09-29 00:00 – Updated: 2025-11-03 21:49
    VLAI
    Summary
    An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being included in a comment.
    Severity
    No CVSS data available.
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • n/a
    Assigner
    Show details on NVD website

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    CVE-2021-23382 (GCVE-0-2021-23382)

    Vulnerability from nvd – Published: 2021-04-26 15:30 – Updated: 2024-09-16 23:26
    VLAI
    Title
    Regular Expression Denial of Service (ReDoS)
    Summary
    The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern \/\*\s* sourceMappingURL=(.*).
    CWE
    • Regular Expression Denial of Service (ReDoS)
    Assigner
    Impacted products
    Vendor Product Version
    n/a postcss Affected: unspecified , < 8.2.13 (custom)
    Date Public
    2021-04-26 00:00
    Credits
    Yeting Li
    Show details on NVD website

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    CVE-2021-23368 (GCVE-0-2021-23368)

    Vulnerability from nvd – Published: 2021-04-12 13:50 – Updated: 2024-09-16 17:27
    VLAI
    Title
    Regular Expression Denial of Service (ReDoS)
    Summary
    The package postcss from 7.0.0 and before 8.2.10 are vulnerable to Regular Expression Denial of Service (ReDoS) during source map parsing.
    CWE
    • Regular Expression Denial of Service (ReDoS)
    Assigner
    Impacted products
    Vendor Product Version
    n/a postcss Affected: 7.0.0 , < unspecified (custom)
    Affected: unspecified , < 8.2.10 (custom)
    Date Public
    2021-04-12 00:00
    Credits
    Yeting Li
    Show details on NVD website

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    CVE-2026-45623 (GCVE-0-2026-45623)

    Vulnerability from cvelistv5 – Published: 2026-07-27 17:23 – Updated: 2026-07-27 17:44
    VLAI
    Title
    PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments
    Summary
    PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*# sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file readable by Node and leak the first ~10 bytes of its content through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is triggered with PostCSS's default options — no from, no map, no plugins required — and is therefore reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles, browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers, etc.). This issue has been fixed in version 8.5.12.
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
    Assigner
    References
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.12
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-41305 (GCVE-0-2026-41305)

    Vulnerability from cvelistv5 – Published: 2026-04-24 02:27 – Updated: 2026-04-24 16:23
    VLAI
    Title
    PostCSS has XSS via Unescaped </style> in its CSS Stringify Output
    Summary
    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.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    Assigner
    References
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.10
    Create a notification for this product.
    Show details on NVD website

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    CVE-2023-44270 (GCVE-0-2023-44270)

    Vulnerability from cvelistv5 – Published: 2023-09-29 00:00 – Updated: 2025-11-03 21:49
    VLAI
    Summary
    An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being included in a comment.
    Severity
    No CVSS data available.
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • n/a
    Assigner
    Show details on NVD website

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    CVE-2021-23382 (GCVE-0-2021-23382)

    Vulnerability from cvelistv5 – Published: 2021-04-26 15:30 – Updated: 2024-09-16 23:26
    VLAI
    Title
    Regular Expression Denial of Service (ReDoS)
    Summary
    The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern \/\*\s* sourceMappingURL=(.*).
    CWE
    • Regular Expression Denial of Service (ReDoS)
    Assigner
    Impacted products
    Vendor Product Version
    n/a postcss Affected: unspecified , < 8.2.13 (custom)
    Date Public
    2021-04-26 00:00
    Credits
    Yeting Li
    Show details on NVD website

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    CVE-2021-23368 (GCVE-0-2021-23368)

    Vulnerability from cvelistv5 – Published: 2021-04-12 13:50 – Updated: 2024-09-16 17:27
    VLAI
    Title
    Regular Expression Denial of Service (ReDoS)
    Summary
    The package postcss from 7.0.0 and before 8.2.10 are vulnerable to Regular Expression Denial of Service (ReDoS) during source map parsing.
    CWE
    • Regular Expression Denial of Service (ReDoS)
    Assigner
    Impacted products
    Vendor Product Version
    n/a postcss Affected: 7.0.0 , < unspecified (custom)
    Affected: unspecified , < 8.2.10 (custom)
    Date Public
    2021-04-12 00:00
    Credits
    Yeting Li
    Show details on NVD website

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