/user/sessions endpoint allows detecting valid accounts
This Security Advisory is about a vulnerability in eZ Platform v1.13, v2.5, and v3.2, and in Ibexa DXP and Ibexa Open Source v3.3. The /user/sessions endpoint can let an attacker detect if a given username or email refers to a valid account. This can be detected through differences in the response data or response time of certain requests. The fix ensures neither attack is possible. The fix is distributed via Composer.
If you come across a security issue in our products, here is how you can report it to us: https://doc.ibexa.co/en/latest/guide/reporting_issues/#toc
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | ezsystems/ezpublish-kernel | >= 6.13.0, < 6.13.8.1, >= 7.5.0, < 7.5.15.1 | 6.13.8.1, 7.5.15.1 |
References
- https://github.com/ezsystems/ezpublish-kernel/security/advisories/GHSA-gmrf-99gw-vvwj
- https://nvd.nist.gov/vuln/detail/CVE-2021-46876
- https://github.com/ezsystems/ezpublish-kernel/commit/b496f073c3f03707d3531a6941dc098b84e3cbed
- https://github.com/ezsystems/ezpublish-kernel
- https://packagist.org/packages/ezsystems/ezpublish-kernel
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-203- Platform
- Composer
- Package
ezsystems/ezpublish-kernel- Disclosed
- 11.03.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gmrf-99gw-vvwj - CC BY 4.0
Vulnerability history: ezsystems/ezpublish-kernel
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 03.2021 05.2024
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 5
- Medium 2
- Low 2
Disclosures per year
- 2021: 2
- 2022: 6
- 2023: 3
- 2024: 3
- 2025: 0
- 2026: 0
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/user/sessions endpoint allows detecting valid accounts this entry
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