What’s Vulnerable › Vulnerabilities

CVE-2019-10909

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-05-16 · updated 2026-06-17
• Weakness: CWE-79

Description

In Symfony before 2.7.51, 2.8.x before 2.8.50, 3.x before 3.4.26, 4.x before 4.1.12, and 4.2.x before 4.2.7, validation messages are not escaped, which can lead to XSS when user input is included. This is related to symfony/framework-bundle.

Affected products

• Drupal: from 8.5.0 before 8.5.15; from 8.6.0 before 8.6.15 — fixed in 8.5.15, 8.6.15
• symfony: from 2.7.0 before 2.7.51; from 2.8.0 before 2.8.50; from 3.4.0 before 3.4.26; from 4.1.0 before 4.1.12; from 4.2.0 before 4.2.7 — fixed in 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7

How to fix

Upgrade to a fixed version: Drupal 8.5.15, 8.6.15; symfony 2.7.51, 2.8.50, 3.4.26, 4.1.12. Check the vendor advisory for mitigations.

References

• https://github.com/symfony/symfony/commit/ab4d05358c3d0dd1a36fc8c306829f68e3dd84e2
• https://symfony.com/blog/cve-2019-10909-escape-validation-messages-in-the-php-templating-engine
• https://www.drupal.org/sa-core-2019-005
• https://www.synology.com/security/advisory/Synology_SA_19_19
• https://github.com/symfony/symfony/commit/ab4d05358c3d0dd1a36fc8c306829f68e3dd84e2
• https://symfony.com/blog/cve-2019-10909-escape-validation-messages-in-the-php-templating-engine
• https://www.drupal.org/sa-core-2019-005
• https://www.synology.com/security/advisory/Synology_SA_19_19

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