withastro up to 6.1.5 HTML Parser defineScriptVars HTML injection

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in withastro astro up to 6.1.5. It has been declared as problematic. Affected is the function defineScriptVars of the component HTML Parser. Executing a manipulation can lead to HTML injection. This vulnerability is tracked as CVE-2026-41067. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in withastro astro up to 6.1.5. It has been declared as problematic. This vulnerability affects the function defineScriptVars of the component HTML Parser. The manipulation with an unknown input leads to a html injection vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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 //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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-41067 since 04/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 6.1.6 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: HTML injection
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: astro 6.1.6

Timelineinfo

04/16/2026 CVE reserved
04/24/2026 +8 days Advisory disclosed
04/24/2026 +0 days VulDB entry created
04/24/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-j687-52p2-xcff
Status: Confirmed

CVE: CVE-2026-41067 (🔒)
GCVE (CVE): GCVE-0-2026-41067
GCVE (VulDB): GCVE-100-359512

Entryinfo

Created: 04/24/2026 20:49
Changes: 04/24/2026 20:49 (66)
Complete: 🔍
Cache ID: 216::103

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