GHSA-22wq-q86m-83fh
svg-sanitizer Bypasses Attribute Sanitization
Quick fix
GHSA-22wq-q86m-83fh — enshrined/svg-sanitize: upgrade to the fixed version with the command below.
composer require enshrined/svg-sanitize:^0.22.0Details
#### 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>`.
Are you affected?
Enter the version of the package you're using.
Affected packages
0Fixed in: 0.22.0composer require enshrined/svg-sanitize:^0.22.0References
- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-22wq-q86m-83fh[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-55166[ADVISORY]
- https://github.com/darylldoyle/svg-sanitizer/commit/0afa95ea74be155a7bcd6c6fb60c276c39984500[WEB]
- https://github.com/darylldoyle/svg-sanitizer/commit/5a0a1eaf0c6b0b540dc945fe30c93cf106b357c1[WEB]
- https://github.com/darylldoyle/svg-sanitizer[PACKAGE]
- https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481[WEB]
- https://github.com/darylldoyle/svg-sanitizer/releases/tag/0.22.0[WEB]