Is CVE-2026-116538 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-116538?

CVE-2026-116538 has a CVSS v3 severity of MEDIUM (4.7).

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CVE-2026-116538

Description

HtmlSanitizer before 9.2.1039 and 10.0 prereleases before 10.0.1037-beta contains a cross-site scripting vulnerability because SanitizeDom(string) never sanitizes attributes on the html and body wrapper elements. Attackers can supply input with a second body or html tag carrying event handlers like onload, executing script when applications render serialized document or body outer HTML.