Plattform
joomla
Behoben in
4.0.1
6.0.1
CVE-2026-21631 describes a Cross-Site Scripting (XSS) vulnerability discovered in the multilingual associations component of Joomla. This vulnerability allows attackers to inject malicious scripts into the application, potentially compromising user sessions and website integrity. The issue affects Joomla versions 4.0.0 through 6.0.3, and a patch is available to address the flaw.
The XSS vulnerability in Joomla's multilingual associations component poses a significant risk to website security. An attacker could leverage this flaw to inject arbitrary JavaScript code into a user's browser when they visit a vulnerable page. This could allow the attacker to steal session cookies, redirect users to malicious websites, deface the website, or even gain complete control of the affected Joomla installation. The impact is particularly severe if the website handles sensitive user data or is used for critical business operations. Successful exploitation could lead to widespread data breaches and reputational damage.
CVE-2026-21631 was publicly disclosed on 2026-04-01. As of this writing, no public proof-of-concept (PoC) code has been released. The vulnerability is not currently listed on the CISA KEV catalog. The potential for exploitation remains, and security professionals should prioritize patching to prevent potential attacks.
Websites utilizing Joomla's multilingual associations component, particularly those running vulnerable versions (4.0.0–6.0.3), are at risk. Shared hosting environments where multiple websites share the same Joomla installation are also at increased risk, as a compromise of one site could potentially impact others.
• wordpress / composer / npm:
grep -r "<script>" /var/www/html/plugins/multilingual_associations/*• generic web:
curl -I https://your-joomla-site.com/plugins/multilingual_associations/?param=<script>alert(1)</script>disclosure
Exploit-Status
EPSS
0.02% (5% Perzentil)
CISA SSVC
The primary mitigation for CVE-2026-21631 is to upgrade Joomla to a patched version. Joomla developers have released updates to address this vulnerability. If immediate upgrading is not possible, consider implementing temporary workarounds such as input validation and output encoding on user-supplied data within the multilingual associations component. Web Application Firewalls (WAFs) configured to detect and block XSS payloads can also provide an additional layer of protection. Regularly review and update Joomla extensions to ensure they are free from vulnerabilities.
Actualice Joomla! a la última versión disponible. Esto solucionará la vulnerabilidad XSS en el componente de asociaciones multilingües.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2026-21631 is a Cross-Site Scripting (XSS) vulnerability in Joomla's multilingual associations component, allowing attackers to inject malicious scripts.
You are affected if your Joomla installation uses the multilingual associations component and is running versions 4.0.0 through 6.0.3.
Upgrade your Joomla installation to a patched version that addresses the vulnerability. Implement WAF rules as an interim measure.
Currently, there are no confirmed reports of active exploitation, but it's crucial to apply the patch promptly.
Refer to the official Joomla security advisory on their website for detailed information and updates.
Lade deine Abhängigkeitsdatei hoch und erfahre sofort, ob dich diese und andere CVEs treffen.
Lade deine Abhängigkeitsdatei hoch und erfahre sofort, ob dich diese und andere CVEs treffen.