Symfony potential Cross-site Scripting vulnerabilities in CodeExtension filters
Description
Some Twig filters in CodeExtension use "is_safe=html" but don't actually ensure their input is safe.
Resolution
Symfony now escapes the output of the affected filters.
The patch for this issue is available here for branch 4.4.
Credits
We would like to thank Pierre Rudloff for reporting the issue and to Nicolas Grekas for providing the fix.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | symfony/symfony | >= 2.0.0, < 4.4.51, >= 5.0.0, < 5.4.31, >= 6.0.0, < 6.3.8 | 4.4.51, 5.4.31, 6.3.8 |
| Composer package | symfony/twig-bridge | >= 2.0.0, < 4.4.51, >= 5.0.0, < 5.4.31, >= 6.0.0, < 6.3.8 | 4.4.51, 5.4.31, 6.3.8 |
References
- https://github.com/symfony/symfony/security/advisories/GHSA-q847-2q57-wmr3
- https://nvd.nist.gov/vuln/detail/CVE-2023-46734
- https://github.com/symfony/symfony/commit/5d095d5feb1322b16450284a04d6bb48d1198f54
- https://github.com/symfony/symfony/commit/9da9a145ce57e4585031ad4bee37c497353eec7c
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2023-46734.yaml
- https://github.com/symfony/symfony
- https://lists.debian.org/debian-lts-announce/2023/11/msg00019.html
- https://symfony.com/cve-2023-46734
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
symfony/symfony, symfony/twig-bridge- Disclosed
- 12.11.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-q847-2q57-wmr3 - CC BY 4.0
Vulnerability history: symfony/twig-bridge
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
- 2
- First → latest
- 11.2023 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 1
- Low 1
Disclosures per year
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 1
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Symfony potential Cross-site Scripting vulnerabilities in CodeExtension filters this entry
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