CVE-2026-41591
- Source
- https://cve.org/CVERecord?id=CVE-2026-41591
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41591.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-41591
- Aliases
- Published
- 2026-05-08T15:22:50.990Z
- Modified
- 2026-07-15T01:49:00.143339938Z
- Severity
-
- 6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
- Summary
- Marko: XSS via case-insensitive script/style closing tag bypass in runtime HTML escaping
- Details
-
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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41591.json", "cwe_ids": [ "CWE-79" ], "cna_assigner": "GitHub_M" }- References
Affected packages
Git / github.com/marko-js/marko
Affected ranges
- Type
- GIT
- Repo
- https://github.com/marko-js/marko
- Events
-
IntroducedLast affected
- Database specific
{ "extracted_events": [ { "introduced": "marko < 5.38.36" }, { "last_affected": "marko < 5.38.36" }, { "introduced": "@marko/runtime-tags < 6.0.164" }, { "last_affected": "@marko/runtime-tags < 6.0.164" } ], "source": "AFFECTED_FIELD" }