TI-2024-18793 Aliases CVE-2024-28234 GHSA-j55w-hjpj-825g

Contao has insufficient BBCode sanitizer

LOW 22CWE-74Published 2024-04-09 · Updated 2024-08-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00572 47th percentileScored 2026-11-07

Fix Fixed contao (contao): 4.13.40, 5.3.4contao/comments-bundle (Packagist): 4.13.40, 5.3.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
contao	contao	2.0.0 to before 4.13.40; 5.0.0 to before 5.3.4	4.13.40, 5.3.4	Patch available	CNA
—	contao/comments-bundle (Packagist)	2.0.0 to before 4.13.40	4.13.40	Patch available	GHSA-j55w-hjpj-825g
—	contao/comments-bundle (Packagist)	5.0.0-RC1 to before 5.3.4	5.3.4	Patch available	GHSA-j55w-hjpj-825g

contao Vendorcontao Affected 2.0.0 to before 4.13.40; 5.0.0 to before 5.3.4 Fixed in 4.13.40, 5.3.4 Patch available CNA
contao/comments-bundle (Packagist) Vendor— Affected 2.0.0 to before 4.13.40 Fixed in 4.13.40 Patch available GHSA-j55w-hjpj-825g
contao/comments-bundle (Packagist) Vendor— Affected 5.0.0-RC1 to before 5.3.4 Fixed in 5.3.4 Patch available GHSA-j55w-hjpj-825g

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:contao:contao::::::::	2.0 to before 4.13.40; 5.0.0 to before 5.3.4	Vulnerable	contao

cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:* Versions 2.0 to before 4.13.40; 5.0.0 to before 5.3.4 Vulnerable ·contao

Remediation

Fix · CNA contao (contao) Fixed in 4.13.40, 5.3.4
Fix · GHSA-j55w-hjpj-825g contao/comments-bundle (Packagist) Fixed in 4.13.40 Advisory →
Fix · GHSA-j55w-hjpj-825g contao/comments-bundle (Packagist) Fixed in 5.3.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2024-28234
2026-10-03 Alias added: GHSA-j55w-hjpj-825g

References

Patch 2

Advisory 3

Other 1

https://github.com/contao/contao

TI-2022-09661 Contao Managed Edition v1.5.0 was discovered to contain a remote command execution (RCE)… CVSS 3.1CRITICAL 9.8
TI-2024-30849 Unrestricted file upload in Contao CVSS 3.1MEDIUM 6.4
TI-2023-18600 Contao cross site scripting vulnerability via input unit widget CVSS 3.1MEDIUM 6.5
TI-2022-08709 Cross site scripting via canonical tag CVSS 3.1HIGH 7.2
TI-2019-08602 Contao 4.x allows SQL Injection. CVSS 3.0CRITICAL 9.8
TI-2024-30447 Remote command execution through file upload in contao/core-bundle CVSS 3.1HIGH 8.8

See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences