CVE-2026-59711

A flaw was found in showdown. This cross-site scripting XSS vulnerability occurs in the metadata title handling when the completeHTMLDocument option is enabled. An attacker can exploit this by injecting unescaped less-than and greater-than characters into markdown frontmatter metadata. This allow...

GHSA-CR32-G25G-VXJJ showdown metadata title handling allows cross-site scripting

showdown contains a cross-site scripting vulnerability in metadata title handling that allows attackers to inject arbitrary HTML and JavaScript. When completeHTMLDocument option is enabled, unescaped less-than and greater-than characters in markdown frontmatter metadata are inserted directly into...

PT-2026-56013

Name of the Vulnerable Software and Affected Versions showdown affected versions not specified Description An issue exists in metadata title handling that allows the injection of arbitrary HTML and JavaScript. When the completeHTMLDocument option is enabled, unescaped less-than and greater-than...