Symfony vulnerable to Session Fixation of CSRF tokens
Description
When authenticating users Symfony by default regenerates the session ID upon login, but preserves the rest of session attributes. Because this does not clear CSRF tokens upon login, this might enables same-site attackers to bypass the CSRF protection mechanism by performing an attack similar to a session-fixation.
Resolution
Symfony removes all CSRF tokens from the session on successful login.
The patch for this issue is available here for branch 4.4.
Credits
We would like to thank Marco Squarcina for reporting the issue and Nicolas Grekas for fixing it.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | symfony/security-bundle | >= 2.0.0, < 4.4.50, >= 5.0.0, < 5.4.20, >= 6.0.0, < 6.0.20, >= 6.1.0, < 6.1.12, >= 6.2.0, < 6.2.6 | 4.4.50, 5.4.20, 6.0.20, 6.1.12, 6.2.6 |
| Composer package | symfony/symfony | >= 2.0.0, < 4.4.50, >= 5.0.0, < 5.4.20, >= 6.0.0, < 6.0.20, >= 6.1.0, < 6.1.12, >= 6.2.0, < 6.2.6 | 4.4.50, 5.4.20, 6.0.20, 6.1.12, 6.2.6 |
References
- https://github.com/symfony/symfony/security/advisories/GHSA-3gv2-29qc-v67m
- https://nvd.nist.gov/vuln/detail/CVE-2022-24895
- https://github.com/symfony/security-bundle/commit/076fd2088ada33d760758d98ff07ddedbf567946
- https://github.com/symfony/symfony/commit/5909d74ecee359ea4982fcf4331aaf2e489a1fd4
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-bundle/CVE-2022-24895.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2022-24895.yaml
- https://github.com/symfony/symfony
- https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html
- https://symfony.com/cve-2022-24895
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-384, CWE-613- Platform
- Composer
- Package
symfony/security-bundle, symfony/symfony- Disclosed
- 01.02.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-3gv2-29qc-v67m - CC BY 4.0
Vulnerability history: symfony/security-bundle
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
- 5
- First → latest
- 11.2021 11.2024
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 3
- Low 1
Disclosures per year
- 2021: 1
- 2022: 2
- 2023: 1
- 2024: 1
- 2025: 0
- 2026: 0
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Symfony vulnerable to Session Fixation of CSRF tokens this entry
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