Astro is a web framework. Prior to 6.1.6, the defineScriptVars function in Astro's server-side rendering pipeline uses a case-sensitive regex /<\/script>/g to sanitize values injected into inline tags via the define:vars directive. HTML parsers close elements case-insensitively and also accept whitespace or / before the closing >, allowing an attacker to bypass the sanitization with payloads like , , or and inject arbitrary HTML/JavaScript. This vulnerability is fixed in 6.1.6.
CVE-2026-41067
This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 83% 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).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(medium)
- EPSS
- 8.7%
- KEV
- Not listed
Published
April 24, 2026
Last Modified
April 27, 2026
References (2)
- security-advisories@githubhttps://github.com/withastro/astro/security/advisories/GHSA-j687-52p2-xcff
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/withastro/astro/security/advisories/GHSA-j687-52p2-xcff
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| astro | — | 6.1.6 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 35× 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.
- 2026-07-11 08:27 UTCEPSS rescore
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- 2026-06-19 19:25 UTCEPSS rescore
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- 2026-06-14 11:41 UTCEG score recompute
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- 2026-06-10 01:52 UTCEG score recompute
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- 2026-06-05 18:34 UTCEG score recompute
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- 2026-06-01 13:12 UTCEG score recompute
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- 2026-05-23 00:08 UTCEG score recompute
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- 2026-05-20 15:48 UTCEG score recompute
- 2026-05-20 11:22 UTCEPSS rescore
- 2026-05-20 11:22 UTCEPSS rescore
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Frequently asked(5)
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Dependency Blast Radius
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