CVE-2026-45066

LOW2.3

Symfony: HtmlSanitizer allowLinkHosts() / allowMediaHosts() Bypass via URL-Parser Differentials and <area> Misclassification

Published Jul 14, 2026

Modified Yesterday

Details

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.

References

WEB

https://github.com/symfony/symfony/commit/d506b556d3d3906f3e8660ad82257ce87edbaac4

WEB

https://github.com/symfony/symfony/releases/tag/v6.4.40

WEB

https://github.com/symfony/symfony/releases/tag/v7.4.12

WEB

https://github.com/symfony/symfony/releases/tag/v8.0.12

WEB

https://github.com/symfony/symfony/security/advisories/GHSA-qc95-4862-92fh

ADVISORY