CVE-2021-21424: Exposure of Sensitive Information to an Unauthorized Actor

May 13, 2021 (updated November 7, 2023)

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 s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist.

References

github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011
github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68
nvd.nist.gov/vuln/detail/CVE-2021-21424

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