Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-45753

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 38.3%
CVSS Severity
CVSS v3 Score 6.1
Products affected by CVE-2026-45753


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