Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | >= 6.1.0, < 6.4.40 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/symfony/commit/487728e7e180a674a6d4c01bd0cb56161cc441Patch
- https://github.com/symfony/symfony/releases/tag/v6.4.40ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v7.4.12ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v8.0.12ProductRelease Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-hhg7-c65m-h7ffPatchVendor Advisory
FAQ
What is CVE-2026-45753?
CVE-2026-45753 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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() omi...
How severe is CVE-2026-45753?
CVE-2026-45753 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45753?
Check the references section above for vendor advisories and patch information. Affected products include: Sensiolabs Symfony.