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      <title>CVE-2026-65911 — DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-65911</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; cure53 DOMPurify&lt;/p&gt;
&lt;p&gt;In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify&amp;#39;s threat model; the referenced advisory lists 3.4.0 as the patched version.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; cure53 DOMPurify&lt;/p&gt;
&lt;p&gt;In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify&amp;#39;s threat model; the referenced advisory lists 3.4.0 as the patched version.&lt;/p&gt;</content:encoded>
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