Threat landscape
high

Joomla CMS: Mehrere Schwachstellen

WID-SEC-2026-0936 · first 01.04.2026 · updated 02.04.2026 · CVSS 9,8

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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 CMS ausnutzen, um Sicherheitsvorkehrungen zu umgehen, SQL-Injection-Angriffe durchzuführen, Daten zu manipulieren oder Cross-Site-Scripting-Angriffe auszuführen.

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

  • Sicherheitsvorkehrungen zu umgehen
  • SQL-Injection-Angriffe durchzuführen
  • Daten zu manipulieren oder Cross-Site-Scripting-Angriffe auszuführen

Am I affected?

Affected according to the BSI:

  • Open Source Joomla CMS <5.4.4
  • Open Source Joomla CMS <6.0.4

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 5.4.4
  • Open Source Joomla CMS 6.0.4

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

CVE: CVE-2026-21629, CVE-2026-21630, CVE-2026-23898, CVE-2026-23899, CVE-2026-21631, CVE-2026-21632

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.

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