CVE-2019-18886
MEDIUM5.3EPSS 1.5%User enumeration leak using switch user functionality in Symfony
Published: 12/2/2019Modified: 5/27/2026
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 packages (4)
- Debian/symfonyfrom 0, < 4.3.8+dfsg-1
- Debian/symfonyfrom 0, < 2.3.21+dfsg-4+deb8u6
- Packagist/symfony/security-http>= 4.1.0, < 4.2.12
- Packagist/symfony/symfony>= 4.1.0, < 4.2.12
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
References (8)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2019-18886
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2019-18886
- WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2019-18886.yaml
- WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18886.yaml
- WEBhttps://github.com/symfony/symfony/releases/tag/v4.3.8
- WEBhttps://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality
- WEBhttps://symfony.com/blog/symfony-4-3-8-released
- WEBhttps://symfony.com/cve-2019-18886