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.
References (3)
Core 3
Core References
Release Notes x_refsource_misc
https://github.com/symfony/symfony/releases/tag/v4.3.8
Release Notes x_refsource_misc
https://symfony.com/blog/symfony-4-3-8-released
Vendor Advisory x_refsource_confirm
https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality
Scores
CVSS v3
5.3
EPSS
0.0155
EPSS Percentile
71.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-203
Status
published
Products (3)
sensiolabs/symfony
4.2.0 - 4.2.11
symfony/security-http
4.1.0 - 4.2.12Packagist
symfony/symfony
4.1.0 - 4.2.12Packagist
Published
Nov 21, 2019
Tracked Since
Feb 18, 2026