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CVE-2026-16633 is a high-severity client-side cross-site scripting vulnerability in Mozilla PDF.js, distributed through pdfjs-dist and inherited by integrations such as ngx-extended-pdf-viewer that bundle vulnerable PDF.js code. A crafted PDF containing malicious XFA content can exploit encoding and sanitization-bypass defects in the escapePDFName and encodeToXmlString routines. Improper zero-padding of escaped control characters and incorrect handling of certain BMP non-characters permit attacker-controlled markup or script to cross rendering boundaries. When processed by a vulnerable viewer, the payload executes JavaScript in the origin of the application embedding the viewer.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity cross-site scripting vulnerability (CWE-79) affecting the pdfjs-dist library. It has a CVSS v3.0 base score of 8.8 and requires user interaction.
A high-severity vulnerability in pdf.js as bundled by ngx-extended-pdf-viewer. Updating ngx-extended-pdf-viewer and related packages to version 29.0.0-rc.3 or later remediates the affected dependency.
Arbitrary JavaScript execution / XSS in ngx-extended-pdf-viewer due to malicious PDF parsing through embedded vulnerable pdf.js XFA handling.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.