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CVE-2019-18886: User enumeration leak using switch user functionality in Symfony

medium Affects symfony/security-http, symfony/symfony. Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

User enumeration leak using switch user functionality in Symfony

Package
symfony/security-http Composer
Affected versions
>=4.1.0 and <4.2.12 or >=4.3.0 and <4.3.8 or >=4.1.0 and <4.2.0 or >=4.2.0 and <4.2.12
Fixed in
4.2.12, 4.3.8
Severity
medium  CVSS 5.3
Exploitation
not on CISA KEV · EPSS 2% (75.1th percentile)
Published
2019-12-02
Source
osv.dev

References

User enumeration leak using switch user functionality in Symfony

Package
symfony/symfony Composer
Affected versions
>=4.1.0 and <4.2.12 or >=4.3.0 and <4.3.8 or >=4.1.0 and <4.2.0 or >=4.2.0 and <4.2.12
Fixed in
4.2.12, 4.3.8
Severity
medium  CVSS 5.3
Exploitation
not on CISA KEV · EPSS 2% (75.1th percentile)
Published
2019-12-02
Source
osv.dev

References

CWE-200CWE-203
NVD recordsymfony/security-http advisoriessymfony/symfony advisories

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