symfony: Symfony is a PHP framework for web and console applications and a set of reusable PHP components
CVE-2026-45753 is fixed in symfony on 1 platform, first by DEBIAN-CVE-2026-45753, released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| symfony · Debian 13.5 (trixie) | 6.4.41+dfsg-0+deb13u1 | DEBIAN-CVE-2026-45753 | May 27, 2026 |
| symfony · Debian 14 | 7.4.12+dfsg-1 | DEBIAN-CVE-2026-45753 | May 27, 2026 |
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