# CVE-2026-45753: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-45753
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 14, 2026

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | symfony Debian 13.5 (trixie) | 6.4.41+dfsg-0+deb13u1 | [DEBIAN-CVE-2026-45753](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45753.md) | May 27, 2026 |
| Linux | symfony Debian 14 | 7.4.12+dfsg-1 | [DEBIAN-CVE-2026-45753](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45753.md) | May 27, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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