What it is about

Keycloak ermöglicht Single Sign-On mit Identity and Access Management für moderne Anwendungen und Dienste. Ein entfernter, anonymer oder lokaler Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen und vertrauliche Informationen preiszugeben.

Under what conditions?

Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.

What can happen in the worst case

An attacker could use the vulnerability to

• einen Denial-of-Service-Zustand zu erzeugen
• vertrauliche Informationen preiszugeben

Am I affected?

Affected according to the BSI:

• IBM InfoSphere Information Server 11.7
• Red Hat Enterprise Linux
• IBM FileNet Content Manager
• Open Source Keycloak <26.1.3
• Red Hat JBoss Data Grid <8.5.3
• Atlassian Confluence <9.2.2
• Atlassian Confluence <9.3.2
• Atlassian Confluence <8.5.21
• Trellix ePolicy Orchestrator <2025 Update 5
• IBM DB2
• Dell ECS <4.2.0.0

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

• Open Source Keycloak 26.1.3
• Red Hat JBoss Data Grid 8.5.3
• Atlassian Confluence 9.2.2
• Atlassian Confluence 9.3.2
• Atlassian Confluence 8.5.21
• Trellix ePolicy Orchestrator 2025 Update 5
• Dell ECS 4.2.0.0

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.