What’s Vulnerable › Vulnerabilities

CVE-2019-18886

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-11-21 · updated 2026-06-17
• Weakness: CWE-203

Description

An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

Affected products

• symfony: from 4.2.0 through 4.2.11; from 4.3.0 through 4.3.7

References

• https://github.com/symfony/symfony/releases/tag/v4.3.8
• https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality
• https://symfony.com/blog/symfony-4-3-8-released
• https://github.com/symfony/symfony/releases/tag/v4.3.8
• https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality
• https://symfony.com/blog/symfony-4-3-8-released

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