CVE-2024-28234
Contao has insufficient BBCode sanitizer
Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Contao has insufficient BBCode sanitizer
Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments.
- Record
CVE-2024-28234- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
EUVDEUVD-2024-1227
Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments.
- Record
EUVD-2024-1227- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-j55w-hjpj-825g
Contao: Insufficient BBCode sanitizer
Impact
If BBCode is enabled for comments, users can inject CSS styles.
Patches
Update to Contao 4.13.40 or 5.3.4.
Workarounds
Disable BBCode for comments.
References
https://contao.org/en/security-advisories/insufficient-bbcode-sanitization
For more information
If you have any questions or comments about this advisory, open an issue in contao/contao.
- Record
GHSA-j55w-hjpj-825g- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
NVD
Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments.
- Record
CVE-2024-28234- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
OSV
Contao has insufficient BBCode sanitizer
Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments.
- Record
CVE-2024-28234- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
OSVGHSA-j55w-hjpj-825g
Contao: Insufficient BBCode sanitizer
Impact
If BBCode is enabled for comments, users can inject CSS styles.
Patches
Update to Contao 4.13.40 or 5.3.4.
Workarounds
Disable BBCode for comments.
References
https://contao.org/en/security-advisories/insufficient-bbcode-sanitization
For more information
If you have any questions or comments about this advisory, open an issue in contao/contao.
- Record
GHSA-j55w-hjpj-825g- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
contao/comments-bundlePackagist |
2.0.0 up to 4.13.40 | 4.13.40 |
contao/comments-bundlePackagist |
5.0.0-RC1 up to 5.3.4 | 5.3.4 |
contao/comments-bundlePackagist |
2.0.0 up to 4.13.40, plus listed versions 4.0.04.0.0-RC14.0.0-beta14.0.14.0.2 Show 45 moreShow less4.0.34.1.04.1.0-RC14.1.0-beta14.1.14.1.24.10.04.10.0-RC14.10.0-RC24.10.0-RC34.10.0-RC44.10.14.10.24.10.34.10.44.10.54.10.64.10.74.11.04.11.0-RC14.11.0-RC24.11.14.11.24.11.34.11.44.11.54.11.64.11.74.11.84.11.94.12.04.12.0-RC14.12.0-RC24.12.0-RC34.12.14.12.24.12.34.12.44.12.54.12.64.12.74.13.04.13.0-RC14.13.0-RC24.13.0-RC3 |
4.13.40 |
contao/comments-bundlePackagist |
5.0.0-RC1 up to 5.3.4, plus listed versions 5.0.05.0.0-RC25.0.0-RC35.0.0-RC45.0.1 Show 45 moreShow less5.0.105.0.25.0.35.0.45.0.55.0.65.0.75.0.85.0.95.1.05.1.0-RC15.1.0-RC25.1.0-RC35.1.15.1.105.1.115.1.25.1.35.1.45.1.55.1.65.1.75.1.85.1.95.2.05.2.0-RC15.2.0-RC25.2.0-RC35.2.0-RC45.2.0-RC55.2.0-RC65.2.15.2.105.2.25.2.35.2.45.2.55.2.65.2.75.2.85.2.95.3.05.3.0-RC15.3.0-RC25.3.0-RC3 |
5.3.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-28234 is a medium vulnerability (CVSS 4.3) in Contao, published April 9, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.57%, the 47th percentile. Fixed in contao/comments-bundle 4.13.40.
References
github.com/contao/contao/security/advisories/GHSA-j55w-hjpj-825g
contao.org/en/security-advisories/insufficient-bbcode-sanitization
nvd.nist.gov/vuln/detail/CVE-2024-28234
Left out here: 227 versions. The JSON record has them.