Red Hat JBoss Enterprise Application Platform (io.undertow.jastow): Schwachstelle ermöglicht Cross-Site Scripting
WID-SEC-2026-2227 · first 08.07.2026 · updated 08.07.2026 · CVSS 6,5
What it is about
JBoss Enterprise Application Platform ist eine skalierbare Plattform für Java-Anwendungen, inklusive JBoss Application Server, JBoss Hibernate und Boss Seam. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat JBoss Enterprise Application Platform ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.
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 Cross-Site Scripting Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Red Hat JBoss Enterprise Application Platform 8.1.7
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
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)
- Red Hat Security Advisory RHSA-2026:36342 vom 2026-07-07 access.redhat.com
- Red Hat Security Advisory RHSA-2026:36343 vom 2026-07-07 access.redhat.com
- Red Hat Security Advisory RHSA-2026:36345 vom 2026-07-07 access.redhat.com
CVE: CVE-2025-12799
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.