VULNERABILITY INTELLIGENCE

CVE-2021-21424

CVSS score5.3 MEDIUM
EPSS probability1.64%
CISA KEVNot currently listed
Published2021-05-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.

Weakness classification

  • security-advisories@github.com: CWE-200
  • nvd@nist.gov: CWE-203

Primary references