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EUVD-2026-249576

fkie_cve-2025-55166

savg-sanitizer is a PHP SVG/XML sanitizer. Prior to version 0.22.0, the sanitization logic in the cleanXlinkHrefs method only searches for lower-case attribute name, which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains. This issue has been patched in version 0.22.0.

GHSA-22wq-q86m-83fh — svg-sanitizer Bypasses Attribute Sanitization

Affected: Packagist: enshrined/svg-sanitize

#### Problem

The sanitization logic at https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481 only searches for lower-case attribute names (e.g. `xlink:href` instead of `xlink:HrEf`), which allows to by-pass the `isHrefSafeValue` check. As a result this allows cross-site scripting or linking to external domains.

#### Proof-of-concept _provided by azizk_

``` <?xml version="1.0" encoding="UTF-8"?> <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="100"> <a xlink:hReF="javascript:alert(document.domain)"> <rect width="100" height="50" fill="red"></rect> <text x="50" y="30" text-anchor="middle" fill="white">Click me</text> </a> </svg> ```

#### Credits

The mentioned findings and proof-of-concept example were reported to the TYPO3 Security Team by the external security researcher `azizk <medazizknani@gmail.com>`.

WID-SEC-W-2025-1834 — TYPO3 Core: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in TYPO3 Core ausnutzen, um Sicherheitsvorkehrungen zu umgehen.