CVE-2026-45753
Severity CVSS v4.0:
LOW
Type:
CWE-79
Cross-Site Scripting (XSS)
Publication date:
14/07/2026
Last modified:
15/07/2026
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.
Impact
Base Score 4.0
2.10
Severity 4.0
LOW
Base Score 3.x
6.10
Severity 3.x
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* | 6.1.0 (including) | 6.4.40 (excluding) |
| cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* | 7.0.0 (including) | 7.4.12 (excluding) |
| cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* | 8.0.0 (including) | 8.0.12 (excluding) |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- https://github.com/symfony/symfony/commit/487728e7e180a674a6d4c01bd0cb56161cc441b7
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12
- https://github.com/symfony/symfony/security/advisories/GHSA-hhg7-c65m-h7ff