Medium severity5.3NVD Advisory· Published May 13, 2021· Updated Jun 17, 2026
CVE-2021-21424
CVE-2021-21424
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/securityPackagist | >= 5.0.0, < 5.2.8 | 5.2.8 |
symfony/security-guardPackagist | >= 2.8.0, < 3.4.48 | 3.4.48 |
symfony/security-guardPackagist | >= 4.0.0, < 4.4.23 | 4.4.23 |
symfony/security-guardPackagist | >= 5.0.0, < 5.2.8 | 5.2.8 |
symfony/security-corePackagist | >= 2.8.0, < 3.4.48 | 3.4.48 |
symfony/security-corePackagist | >= 4.0.0, < 4.4.23 | 4.4.23 |
symfony/security-corePackagist | >= 5.0.0, < 5.2.8 | 5.2.8 |
lexik/jwt-authentication-bundlePackagist | >= 2.0.0, < 2.10.7 | 2.10.7 |
lexik/jwt-authentication-bundlePackagist | >= 2.11.0, < 2.11.3 | 2.11.3 |
symfony/maker-bundlePackagist | >= 1.27.0, < 1.29.2 | 1.29.2 |
symfony/maker-bundlePackagist | >= 1.30.0, < 1.31.1 | 1.31.1 |
symfony/security-httpPackagist | >= 5.1.0, < 5.2.8 | 5.2.8 |
symfony/securityPackagist | >= 2.8.0, < 3.4.49 | 3.4.49 |
symfony/securityPackagist | >= 4.0.0, < 4.4.24 | 4.4.24 |
symfony/symfonyPackagist | >= 2.8.0, < 3.4.49 | 3.4.49 |
symfony/symfonyPackagist | >= 4.0.0, < 4.4.24 | 4.4.24 |
symfony/symfonyPackagist | >= 5.0.0, < 5.2.9 | 5.2.9 |
Affected products
12cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*range: >=2.8.0,<3.4.48
- (no CPE)range: >= 2.8.0, < 3.4.48
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- osv-coords8 versionspkg:bitnami/symfonypkg:composer/lexik/jwt-authentication-bundlepkg:composer/symfony/maker-bundlepkg:composer/symfony/securitypkg:composer/symfony/security-corepkg:composer/symfony/security-guardpkg:composer/symfony/security-httppkg:composer/symfony/symfony
>= 2.8.0, < 3.4.48+ 7 more
- (no CPE)range: >= 2.8.0, < 3.4.48
- (no CPE)range: >= 2.0.0, < 2.10.7
- (no CPE)range: >= 1.27.0, < 1.29.2
- (no CPE)range: >= 5.0.0, < 5.2.8
- (no CPE)range: >= 2.8.0, < 3.4.48
- (no CPE)range: >= 2.8.0, < 3.4.48
- (no CPE)range: >= 5.1.0, < 5.2.8
- (no CPE)range: >= 2.8.0, < 3.4.49
Patches
Vulnerability mechanics
References
24- github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011nvdPatchThird Party AdvisoryWEB
- github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68nvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-5pv8-ppvj-4h68ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-21424ghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/lexik/jwt-authentication-bundle/CVE-2021-21424.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/maker-bundle/CVE-2021-21424.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-guard/CVE-2021-21424.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-21424.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2021-21424.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-21424.yamlghsaWEB
- lists.debian.org/debian-lts-announce/2023/07/msg00014.htmlnvdWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2MghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJWghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3ghsaWEB
- lists.fedoraproject.org/archives/list/[email protected]/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4ghsaWEB
- lists.fedoraproject.org/archives/list/[email protected]/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2MghsaWEB
- lists.fedoraproject.org/archives/list/[email protected]/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJWghsaWEB
- lists.fedoraproject.org/archives/list/[email protected]/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3ghsaWEB
- symfony.com/cve-2021-21424ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3/nvd
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