CVE-2026-41591
Last modified
CVE-2026-41591 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openjsf | Marko | < 5.38.36 |
| Openjsf | Marko\/Runtime-Tags | < 6.0.164 |
References
- https://github.com/marko-js/marko/security/advisories/GHSA-x9fj-57fh-c8wqExploit, Mitigation, Patch, Vendor Advisory
- https://github.com/marko-js/marko/security/advisories/GHSA-x9fj-57fh-c8wqExploit, Mitigation, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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