CVE-2026-45753
Symfony: HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — javascript: URI Survives Sanitization (XSS)
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlAttributeSanitizer::getSupportedAttributes() omits URL-valued attributes including action, formaction, poster, and cite, so configurations that admit those attributes can leave javascript: URIs unsanitized and enable XSS when the resulting HTML is rendered or a victim submits a form or clicks a button. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
| CWE | CWE-79 CWE-184 |
| Vendor | symfony |
| Product | symfony |
| Published | Jul 14, 2026 |
| Last Updated | Jul 14, 2026 |
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Affected Versions
symfony / symfony
>= 6.1.0-BETA1, < 6.4.40 >= 7.0.0-BETA1, < 7.4.12 >= 8.0.0-BETA1, < 8.0.12
symfony / html-sanitizer
>= 6.1.0-BETA1, < 6.4.40 >= 7.0.0-BETA1, < 7.4.12 >= 8.0.0-BETA1, < 8.0.12
References
github.com: https://github.com/symfony/symfony/security/advisories/GHSA-hhg7-c65m-h7ff github.com: https://github.com/symfony/symfony/commit/487728e7e180a674a6d4c01bd0cb56161cc441b7 github.com: https://github.com/symfony/symfony/releases/tag/v6.4.40 github.com: https://github.com/symfony/symfony/releases/tag/v7.4.12 github.com: https://github.com/symfony/symfony/releases/tag/v8.0.12