User enumeration in authentication mechanisms
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- Information disclosure
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-200.
Summary
Description ----------- The ability to enumerate users was possible without relevant permissions due to different exception messages depending on whether the user existed or not. It was also possible to enumerate users by using a timing attack, by comparing time elapsed when authenticating an existing user and authenticating a non-existing user. Resolution ---------- We now ensure that 403s are returned whether the user exists or not if the password is invalid or if the user does not exist. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011) for branch 3.4. Credits ------- I would like to thank James Isaac and Mathias Brodala for reporting the issue and Robin Chalas for fixing the issue.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | symfony/security-http (Packagist) | 5.1.0 to before 5.2.8 | 5.2.8 | Patch available | GHSA-g2qj-pmxm-9f8f |
| — | symfony/symfony (Packagist) | 5.1.0 to before 5.2.8 | 5.2.8 | Patch available | GHSA-g2qj-pmxm-9f8f |
- symfony/security-http (Packagist) Vendor— Affected 5.1.0 to before 5.2.8 Fixed in 5.2.8 Patch available GHSA-g2qj-pmxm-9f8f
- symfony/symfony (Packagist) Vendor— Affected 5.1.0 to before 5.2.8 Fixed in 5.2.8 Patch available GHSA-g2qj-pmxm-9f8f
Remediation
- Fix · GHSA-g2qj-pmxm-9f8f symfony/security-http (Packagist) Fixed in 5.2.8 Advisory →
- Fix · GHSA-g2qj-pmxm-9f8f symfony/symfony (Packagist) Fixed in 5.2.8 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-g2qj-pmxm-9f8f
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences