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.
CVE-2024-28234
This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 28% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.3
- EG Score
- 4.3(medium)
- EPSS
- 43.3%
- KEV
- Not listed
Published
April 9, 2024
Last Modified
January 2, 2025
References (8)
- security-advisories@githubhttps://contao.org/en/security-advisories/insufficient-bbcode-sanitization
- security-advisories@githubhttps://github.com/contao/contao/commit/55b995d8d35da0d36bc6a22c53fe6423ab0c4ae2
- security-advisories@githubhttps://github.com/contao/contao/commit/6d42e667177c972ae7c219645593c262d7764ce2
- security-advisories@githubhttps://github.com/contao/contao/security/advisories/GHSA-j55w-hjpj-825g
- af854a3a-2127-422b-91ae-364da2661108https://contao.org/en/security-advisories/insufficient-bbcode-sanitization
- af854a3a-2127-422b-91ae-364da2661108https://github.com/contao/contao/commit/55b995d8d35da0d36bc6a22c53fe6423ab0c4ae2
- af854a3a-2127-422b-91ae-364da2661108https://github.com/contao/contao/commit/6d42e667177c972ae7c219645593c262d7764ce2
- af854a3a-2127-422b-91ae-364da2661108https://github.com/contao/contao/security/advisories/GHSA-j55w-hjpj-825g
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| contao/comments-bundle | 5.0.0 ... 5.3.3 (55 versions) | 5.3.4 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 51× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-12 05:45 UTCEPSS rescore
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- 2026-05-24 04:58 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-74
- CVE-2015-10062NVD 5.5EG 9.8MEDIUM
- CVE-2015-10027NVD 5.5EG 9.8MEDIUM
- CVE-2016-15007NVD 5.5EG 9.8MEDIUM
- CVE-2016-15004NVD 7.3EG 9.8HIGH
- CVE-2013-4144EG 9.8CRITICAL
- CVE-2013-7487EG 9.8CRITICAL
- CVE-2014-4678EG 9.8EPSS 92%CRITICAL
- CVE-2014-4967EG 9.8CRITICAL
- CVE-2014-4966EG 9.8CRITICAL
- CVE-2013-7381EG 9.8CRITICAL
Frequently asked(5)
What is CVE-2024-28234?
When was CVE-2024-28234 disclosed?
Is CVE-2024-28234 actively exploited?
What is the CVSS score of CVE-2024-28234?
How do I remediate CVE-2024-28234?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-28234
Is Your Infrastructure Affected by CVE-2024-28234?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.