PKSA-t3wq-xfwt-t1h9: HtmlSanitizer Does Not URL-Sanitize srcset and imagesrcset: Media Scheme and Host Allow-List Bypass
Published Nov 4, 2026
·Updated
HtmlSanitizer Does Not URL-Sanitize srcset and imagesrcset: Media Scheme and Host Allow-List Bypass
Affected Software
11 affected componentsFixes available
composer/symfony/symfony>=6.1.0, <6.2.0
composer/symfony/symfony>=6.2.0, <6.3.0
composer/symfony/symfony>=6.3.0, <6.4.0
composer/symfony/symfony>=6.4.0, <6.4.50
6.4.50
composer/symfony/symfony>=7.0.0, <7.1.0
composer/symfony/symfony>=7.1.0, <7.2.0
composer/symfony/symfony>=7.2.0, <7.3.0
composer/symfony/symfony>=7.3.0, <7.4.0
composer/symfony/symfony>=7.4.0, <7.4.23
7.4.23
composer/symfony/symfony>=8.0.0, <8.1.0
composer/symfony/symfony>=8.1.0, <8.1.11
8.1.11
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
composer/symfony/symfonyto a version that resolves this vulnerability.Fixed in 6.4.50 - Upgrade
Upgrade
composer/symfony/symfonyto a version that resolves this vulnerability.Fixed in 7.4.23 - Upgrade
Upgrade
composer/symfony/symfonyto a version that resolves this vulnerability.Fixed in 8.1.11
Event History
Nov 4, 2026
Advisory Published
via Packagist·12:00 AM
Data Sourced
via Packagist·12:00 AM
DescriptionSeverityAffected Software