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
Affected Vendors & Products
References
History
Fri, 08 May 2026 22:15:00 +0000
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ssvc
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Fri, 08 May 2026 16:00:00 +0000
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| 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. | |
| Title | Marko: XSS via case-insensitive script/style closing tag bypass in runtime HTML escaping | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-05-08T21:26:58.356Z
Reserved: 2026-04-21T14:15:21.960Z
Link: CVE-2026-41591
Updated: 2026-05-08T17:08:56.881Z
Status : Received
Published: 2026-05-08T16:16:11.167
Modified: 2026-05-08T22:16:30.647
Link: CVE-2026-41591
No data.
OpenCVE Enrichment
Updated: 2026-05-08T19:15:14Z