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CVE-2026-59926

Mistune: XSS via unescaped class option in Admonition directive PUBLISHED

Description (CNA)

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.

Affected (CNA)

Vendor / productVersions
lepture / mistuneaffected < 3.2.1

CWE

CWE-79

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.