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CVE-2026-16633 is a client-side remote code execution vulnerability manifesting as cross-site scripting in applications that use vulnerable builds of ngx-extended-pdf-viewer, which bundles a vulnerable version of Mozilla pdf.js. The flaw is triggered when the viewer opens a crafted PDF containing malicious XML Forms Architecture (XFA) content. During parsing and rendering of attacker-controlled XFA parameters, insufficient sanitization allows arbitrary JavaScript to execute in the origin of the hosting web application. The reported root causes are improper zero-padding of low control characters in the pdf.js escapePDFName function and incorrect surrogate-pair handling in encodeToXmlString, enabling sanitizer bypass and injection of active markup or script content. Affected ngx-extended-pdf-viewer versions are 27.0.0-rc.0 through before 29.0.0-rc.3.
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