CVE-2026-45066
Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification
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, HtmlSanitizer URL sanitization can allow off-allowlist URLs through allowLinkHosts() or allowMediaHosts() because UrlSanitizer::parse() follows RFC 3986 while browsers follow WHATWG URL parsing, and because <area href> is checked against the media policy rather than the link policy. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
| CWE | CWE-184 CWE-436 |
| Vendor | symfony |
| Product | symfony |
| Published | 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-qc95-4862-92fh github.com: https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4 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