Vulnerability Monitor

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CVE-2019-18886

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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.3, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, for affected systems. Impacting 1 product from sensiolabs organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-11-21T18:15:11.820

Last Modified

2024-11-21T04:33:46.837

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-203

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	sensiolabs	symfony	≤ 4.2.11	Yes
Application	sensiolabs	symfony	≤ 4.3.7	Yes

References

https://github.com/symfony/symfony/releases/tag/v4.3.8 Release Notes ([email protected])
https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality Vendor Advisory ([email protected])
https://symfony.com/blog/symfony-4-3-8-released Release Notes ([email protected])
https://github.com/symfony/symfony/releases/tag/v4.3.8 Release Notes (af854a3a-2127-422b-91ae-364da2661108)
https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://symfony.com/blog/symfony-4-3-8-released Release Notes (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For sensiolabs's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.