[20240205] - Core - Inadequate content filtering within the filter code

published 2024-02-20 2 y ago modified 2026-09-08 2 mo ago also BIT-joomla-2024-21726 , EUVD-2024-19342

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 48.8%; EPSS 48.8% chance of exploitation in 30 days, percentile 98%
public exploits: 0; none known

Inadequate content filtering leads to XSS vulnerabilities in various components.

Patch / fix

fixed in 2

bitnami joomla 5.1.0
joomla joomla! 4.4.3, 5.0.3

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-02-29)

Exploit prediction

48.84% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

sonarsource.com https://www.sonarsource.com/blog/joomla-multiple-xss-vulnerabilities/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
OSV	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Affected packages

ecosystem	package	affected	fixed in
bitnami	joomla	>=3.7.0, <5.1.0	5.1.0

Affected products

Joomla! Project Joomla! CMS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

sonarsource.com /blog/joomla-multiple-xss-vulnerabilities/
technical-description, exploit, third-party-advisory, advisory
developer.joomla.org /security-centre/929-20240205-core-inadequate-content-filtering-within-the-filter-code.html
vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2024-21726
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary