CVE-2026-41305

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 ` sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML tags, ` in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

April 24, 2026

Last Modified

April 24, 2026

Advisory Details (2)

Auto-updated Aug 2, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

XSS via Unescaped </style> in CSS Stringify Output · Advisory · postcss/postcss · GitHub

https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93
github_release Patch Available

8.5.10

Patch available: postcss/postcss 8.5.10

https://github.com/postcss/postcss/releases/tag/8.5.10

Vendor Advisories for CVE-2026-41305(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
node-postcss8.2.1+~cs5.3.23-8 ... 8.5.9+~cs9.3.30-1 (31 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-postcss8.4.20+~cs8.0.23-1 ... 8.5.9+~cs9.3.30-1 (18 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-postcss8.4.49+~cs9.2.32-1 ... 8.5.9+~cs9.3.30-1 (14 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-postcss8.4.49+~cs9.2.32-1, 8.5.6+~cs9.3.28-1, 8.5.8+~cs9.3.30-1, 8.5.9+~cs9.3.30-18.5.12+~cs9.3.32-1—
npm(1)
PackageVulnerable rangeFixed inDependents
postcss—8.5.10—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 148 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 14:53 UTCEPSS rescore
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  10. 2026-09-04 03:29 UTCOSV refresh
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  24. 2026-08-17 14:54 UTCEG score recompute
  25. 2026-08-17 13:47 UTCEPSS rescore
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  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 05:50 UTCEG score recompute
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  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-12 17:54 UTCEG score recompute
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  10. 2026-08-11 06:12 UTCEG score recompute
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  12. 2026-08-10 04:47 UTCEG score recompute
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  17. 2026-08-06 13:46 UTCEPSS rescore
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  19. 2026-08-05 19:17 UTCEPSS rescore
  20. 2026-08-04 15:10 UTCEPSS rescore
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  22. 2026-08-03 21:07 UTCEG score recompute
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  24. 2026-08-02 11:27 UTCEG score recompute
  25. 2026-08-02 02:27 UTCEPSS rescore
  26. 2026-08-01 04:16 UTCEPSS rescore
  27. 2026-07-30 16:28 UTCEPSS rescore
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  36. 2026-07-23 03:11 UTCEG score recompute
  37. 2026-07-22 14:08 UTCEPSS rescore
  38. 2026-07-21 15:24 UTCEPSS rescore
  39. 2026-07-20 17:08 UTCEPSS rescore
  40. 2026-07-19 23:08 UTCOSV refresh
  41. 2026-07-19 14:31 UTCEPSS rescore
  42. 2026-07-19 02:29 UTCEPSS rescore
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  44. 2026-07-16 17:03 UTCEPSS rescore
  45. 2026-07-15 16:57 UTCEPSS rescore
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  48. 2026-07-13 22:30 UTCEPSS rescore
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  51. 2026-07-12 05:46 UTCEPSS rescore
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  53. 2026-07-09 19:10 UTCEPSS rescore
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  73. 2026-06-22 14:25 UTCEPSS rescore
  74. 2026-06-21 14:56 UTCEPSS rescore
  75. 2026-06-21 14:56 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-41305?
CVE-2026-41305 is a medium vulnerability published on April 24, 2026. 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…
When was CVE-2026-41305 disclosed?
CVE-2026-41305 was first published in the National Vulnerability Database on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41305 actively exploited?
CVE-2026-41305 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.4% of all scored CVEs.
What is the CVSS score of CVE-2026-41305?
CVE-2026-41305 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-41305?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41305, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-41305

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