enshrined/svg-sanitize: Stored XSS via DTD Entity / HTML5 Named Character Reference Collision

[ Description ]Official description

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, svg-sanitizer's isHrefSafeValue() validates an SVG href after XML DTD entity expansion, but saveXML() serializes the original entity reference after removing the DTD declaration. A crafted entity such as Tab can appear to the sanitizer as a safe fragment prefix while HTML5 Named Character Reference resolution during inline HTML rendering later converts the surviving reference to whitespace, exposing a javascript: URL. When an application embeds the sanitized SVG inline, a user who activates the link can cause script to execute in the embedding page's origin. This issue is fixed in version 1.0.0.

[ Fixes ]Fixes and patches

• enshrined/svg-sanitize 1.0.0Fixed version · GitHub Advisories · composer package enshrined/svg-sanitize: upgrade to 1.0.0 or later (affected <= 0.22.0)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund19 Oct 2026WID-SEC-2026-4047

  Snipe-IT: Multiple vulnerabilities Translated from German

  CVE-2026-109413CVE-2026-55599CVE-2026-45073+9 more CVEs

[ Packages ]Affected open-source packages

• enshrined/svg-sanitize composerAffected <= 0.22.0 · fixed in 1.0.0 · GHSA-9rjx-3jch-6vjf

[ References ]References

• github.com/darylldoyle/svg-sanitizer/commit/23877db7e76f1e1df5c3e65ab30239219c3d2867
• github.com/darylldoyle/svg-sanitizer/releases/tag/1.0.0
• github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-9rjx-3jch-6vjf