https://db.gcve.eu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Fri, 16 Oct 2026 22:59:31 +0000 https://db.gcve.eu/vuln/ghsa-cjmm-f4jc-qw8r <p><strong>Affected:</strong> npm: dompurify</p> <p>## Summary DOMPurify allows `ADD_ATTR` to be provided as a predicate function via `EXTRA_ELEMENT_HANDLING.attributeCheck`. When the predicate returns `true`, `_isValidAttribute` short-circuits the attribute check before URI-safe validation runs. An attacker who supplies a predicate that accepts specific attribute/tag combinations can then sanitize input such as `&lt;a href=&#34;javascript:alert(document.domain)&#34;&gt;` and have the `javascript:` URL survive, because URI validation is skipped for that attribute while other checks still pass. The provided PoC accepts `href` for anchors and then triggers a click inside an iframe, showing that the sanitized payload executes despite the protocol bypass.</p> <p>## Impact Predicate-based allowlisting bypasses DOMPurify&#39;s URI validation, allowing unsafe protocols such as `javascript:` to reach the DOM and execute whenever the link is activated, resulting in DOM-based XSS.</p> <p>## Credits Identified by Cantina’s Apex (https://www.cantina.security).</p> <p><strong>Affected:</strong> npm: dompurify</p> <p>## Summary DOMPurify allows `ADD_ATTR` to be provided as a predicate function via `EXTRA_ELEMENT_HANDLING.attributeCheck`. When the predicate returns `true`, `_isValidAttribute` short-circuits the attribute check before URI-safe validation runs. An attacker who supplies a predicate that accepts specific attribute/tag combinations can then sanitize input such as `&lt;a href=&#34;javascript:alert(document.domain)&#34;&gt;` and have the `javascript:` URL survive, because URI validation is skipped for that attribute while other checks still pass. The provided PoC accepts `href` for anchors and then triggers a click inside an iframe, showing that the sanitized payload executes despite the protocol bypass.</p> <p>## Impact Predicate-based allowlisting bypasses DOMPurify&#39;s URI validation, allowing unsafe protocols such as `javascript:` to reach the DOM and execute whenever the link is activated, resulting in DOM-based XSS.</p> <p>## Credits Identified by Cantina’s Apex (https://www.cantina.security).</p> https://db.gcve.eu/vuln/ghsa-cjmm-f4jc-qw8r