GHSA-x7m8-jrm8-hpvx

@eigenpal/docx-editor-react: CSS injection and print-time XSS via unescaped embedded font-family name

Published

2026-09-10

Modified

2026-09-10

Sources

github-advisory

Summary

## Summary Embedded font-family names (`word/fontTable.xml`) were interpolated unescaped into an injected `@font-face` ` ` and into the print window's `document.write()`. A crafted name injects page-wide CSS on open, and breaks out of ` ` into executable HTML on Print. ## Impact Opening a crafted `.docx` applies attacker-controlled CSS page-wide with zero clicks (overlay/phishing, attribute-selector exfiltration of input values, tracking beacons). Clicking Print escalates to script execution in the embedder's origin. ## Remediation Upgrade to 1.8.3. Font names are CSS-escaped before interpolation (quotes, backslash, ` `, and CSS newlines), and the print window is assembled with DOM APIs instead of `document.write`.

Affected packages

Remediation: Upgrade to 1.8.3 or later.

References

• https://github.com/advisories/GHSA-x7m8-jrm8-hpvx