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CVE-2025-70402 is described as a critical DOM-based cross-site scripting vulnerability in Apryse WebViewer (formerly PDFTron) where the uiConfig query parameter is trusted as a remote URL, fetched, parsed as JSON, and applied to the WebViewer UI. A malicious value in a uiConfig field (described as a “glyph” field) is propagated into a React component (Icon.js) and rendered via dangerouslySetInnerHTML without sanitization, enabling script execution in the context of the WebViewer origin. The disclosure notes an SVG <foreignObject> technique to achieve script execution as a bypass despite DOMParser behavior when handling image/svg+xml.
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No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A flaw in Apryse WebViewer where remote configuration files are improperly trusted, enabling malicious code execution via a crafted link (one-click style attack).
One of several reported vulnerabilities affecting Foxit and Apryse PDF platforms, potentially enabling impacts such as account takeover, session hijacking, data exfiltration, and arbitrary JavaScript execution.
A critical DOM-based XSS in Apryse WebViewer where a remotely fetched uiConfig JSON can inject attacker-controlled content that reaches dangerouslySetInnerHTML, enabling script execution via SVG/foreignObject parsing-context bypass.
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.