CVE-2019-18886

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.

• CWE-203

• https://github.com/symfony/symfony/releases/tag/v4.3.8Release Notes
• https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionalityVendor Advisory
• https://symfony.com/blog/symfony-4-3-8-releasedRelease Notes
• https://github.com/symfony/symfony/releases/tag/v4.3.8Release Notes
• https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionalityVendor Advisory
• https://symfony.com/blog/symfony-4-3-8-releasedRelease Notes

Published

Nov 21, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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