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8 vulnerabilities found for postcss by postcss
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.
Severity
6.1 (Medium)
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
2 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss/security/advis… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss/releases/tag/8.5.10 | x_refsource_MISC |
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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
References
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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=(.*).
Severity
5.3 (Medium)
CWE
- Regular Expression Denial of Service (ReDoS)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640 | x_refsource_MISC |
| https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1255641 | x_refsource_MISC |
| https://github.com/postcss/postcss/commit/2b1d04c… | x_refsource_MISC |
Impacted products
Date Public
2021-04-26 00:00
Credits
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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.
Severity
5.3 (Medium)
CWE
- Regular Expression Denial of Service (ReDoS)
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://snyk.io/vuln/SNYK-JS-POSTCSS-1090595 | x_refsource_MISC |
| https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1244795 | x_refsource_MISC |
| https://github.com/postcss/postcss/commit/b6f3e4d… | x_refsource_MISC |
| https://github.com/postcss/postcss/commit/8682b1e… | x_refsource_MISC |
| https://lists.apache.org/thread.html/r16e295b4f02… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r8def971a66c… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r00158f5d770… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r5acd89f3827… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/rad5af2044af… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r49afb49b387… | mailing-listx_refsource_MLIST |
Impacted products
Date Public
2021-04-12 00:00
Credits
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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.
Severity
6.1 (Medium)
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
2 references
| URL | Tags |
|---|---|
| https://github.com/postcss/postcss/security/advis… | x_refsource_CONFIRM |
| https://github.com/postcss/postcss/releases/tag/8.5.10 | x_refsource_MISC |
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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
References
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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=(.*).
Severity
5.3 (Medium)
CWE
- Regular Expression Denial of Service (ReDoS)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640 | x_refsource_MISC |
| https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1255641 | x_refsource_MISC |
| https://github.com/postcss/postcss/commit/2b1d04c… | x_refsource_MISC |
Impacted products
Date Public
2021-04-26 00:00
Credits
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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.
Severity
5.3 (Medium)
CWE
- Regular Expression Denial of Service (ReDoS)
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://snyk.io/vuln/SNYK-JS-POSTCSS-1090595 | x_refsource_MISC |
| https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1244795 | x_refsource_MISC |
| https://github.com/postcss/postcss/commit/b6f3e4d… | x_refsource_MISC |
| https://github.com/postcss/postcss/commit/8682b1e… | x_refsource_MISC |
| https://lists.apache.org/thread.html/r16e295b4f02… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r8def971a66c… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r00158f5d770… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r5acd89f3827… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/rad5af2044af… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r49afb49b387… | mailing-listx_refsource_MLIST |
Impacted products
Date Public
2021-04-12 00:00
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