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CVE-2026-41591— Marko: XSS via case-insensitive script/style closing tag bypass in runtime HTML escaping

CVSS 6.4 · Medium EPSS 0.03% · P10
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I. Basic Information for CVE-2026-41591

Vulnerability Information
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Vulnerability Title
Marko: XSS via case-insensitive script/style closing tag bypass in runtime HTML escaping
Source: NVD (National Vulnerability Database)
Vulnerability Description
Marko is a declarative, HTML-based language for building web apps. Prior to marko version 5.38.36 and prior to @marko/runtime-tags 6.0.164, when dynamic text is interpolated into a <script> or <style> tag the Marko runtime failed to prevent tag breakout when the closing tag used non-lowercase casing. An attacker able to place input inside a <script> or <style> block could break out of the tag with </SCRIPT>, </Style>, etc. and inject arbitrary HTML/JavaScript, resulting in cross-site scripting. This issue has been patched in marko version 5.38.36 and @marko/runtime-tags 6.0.164.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
marko 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
marko是marko开源的一个声明式HTML语言，用于构建动态用户界面。 Marko 5.38.36之前版本存在跨站脚本漏洞，该漏洞源于动态文本插入到script或style标签时未阻止非小写闭合标签的逃逸，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
marko-jsmarko marko < 5.38.36 -

II. Public POCs for CVE-2026-41591

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III. Intelligence Information for CVE-2026-41591

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IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-41591

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