CVE-2019-18886
unknown
CVSS v3
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CVSS v4 NEW
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VIR risk
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Description
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.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.3.8+dfsg-1 |
| sid | Fixed | 4.3.8+dfsg-1 |
| forky | Fixed | 4.3.8+dfsg-1 |
| bullseye | Fixed | 4.3.8+dfsg-1 |
| bookworm | Fixed | 4.3.8+dfsg-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | symfony/security-http | >=4.1.0,<4.2.12 | 4.2.12 |
| Packagist | symfony/security-http | >=4.3.0,<4.3.8 | 4.3.8 |
| Packagist | symfony/symfony | >=4.1.0,<4.2.12 | 4.2.12 |
| Packagist | symfony/symfony | >=4.3.0,<4.3.8 | 4.3.8 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2019-18886
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2019-18886.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18886.yaml
- https://github.com/symfony/symfony/releases/tag/v4.3.8
- https://symfony.com/blog/cve-2019-18886-prevent-user-enumeration-using-switch-user-functionality
- https://symfony.com/blog/symfony-4-3-8-released
- https://symfony.com/cve-2019-18886
- https://security-tracker.debian.org/tracker/CVE-2019-18886
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.