What’s Vulnerable › Vulnerabilities

CVE-2025-55166: svg-sanitizer By-Passing Attribute Sanitization

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-12 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• darylldoyle svg-sanitizer: before 0.22.0

References

• https://github.com/darylldoyle/svg-sanitizer/commit/5a0a1eaf0c6b0b540dc945fe30c93cf106b357c1
• https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-22wq-q86m-83fh

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