Governikus AusweisApp2: Schwachstelle ermöglicht Cross-Site Scripting
WID-SEC-2026-3356 · first 15.09.2026 · updated 15.09.2026 · CVSS 4,3
What it is about
Die Governikus AusweisApp2 ist eine Software, die es Nutzern ermöglicht, sich online mit ihrem deutschen Personalausweis (eID) zu authentifizieren. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Governikus AusweisApp2 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:
- Governikus AusweisApp2 <2.5.5
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Governikus AusweisApp2 2.5.5
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)
- GitHub Advisory Database vom 2026-09-14 github.com
- EU Vulnerability Database vom 2026-09-14 euvd.enisa.europa.eu
CVE: CVE-2026-90848
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.