Joomla: Mehrere Schwachstellen
WID-SEC-2026-2926 · first 19.08.2026 · updated 19.08.2026 · CVSS 9,1
What it is about
Joomla ist ein freies Content-Management-System, basierend auf der Scriptsprache PHP und einer SQL-Datenbank. Über zahlreiche Extensions kann der Funktionsumfang der Core-Installation individuell erweitert werden. Ein Angreifer kann mehrere Schwachstellen in Joomla ausnutzen, um beliebigen Programmcode auszuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode auszuführen
- Informationen offenzulegen
- Dateien zu manipulieren
- einen Cross-Site Scripting Angriff durchzuführen
- Sicherheitsvorkehrungen zu umgehen
Am I affected?
Affected according to the BSI:
- Open Source Joomla CMS <5.4.8
- Open Source Joomla CMS <6.1.3
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Joomla CMS 5.4.8
- Open Source Joomla CMS 6.1.3
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Joomla Core Security Advisory 20260801 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260802 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260803 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260804 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260805 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260806 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260807 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260808 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260809 vom 2026-08-18 developer.joomla.org
- Joomla Core Security Advisory 20260810 vom 2026-08-18 developer.joomla.org
CVE: CVE-2026-71572, CVE-2026-71573, CVE-2026-71574, CVE-2026-72531, CVE-2026-72532, CVE-2026-73336, CVE-2026-73337, CVE-2026-73371, CVE-2026-73372, CVE-2026-73373
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.