Symfony · Symfony · CVE-2019-10909
**Name of the Vulnerable Software and Affected Versions**
Symfony versions prior to 2.7.51
Symfony versions 2.8.x prior to 2.8.50
Symfony versions 3.x prior to 3.4.26
Symfony versions 4.x prior to 4.1.12
Symfony versions 4.2.x prior to 4.2.7
**Description**
The issue is related to the lack of protection measures for web page structures in the symfony/framework-bundle of the Symfony platform, which can lead to XSS attacks when user input is included in validation messages. This can allow a remote attacker to perform an XSS attack.
**Recommendations**
For Symfony versions prior to 2.7.51, update to version 2.7.51 or later.
For Symfony versions 2.8.x prior to 2.8.50, update to version 2.8.50 or later.
For Symfony versions 3.x prior to 3.4.26, update to version 3.4.26 or later.
For Symfony versions 4.x prior to 4.1.12, update to version 4.1.12 or later.
For Symfony versions 4.2.x prior to 4.2.7, update to version 4.2.7 or later.