CVE-2026-90848 Governikus CVE debrief

Who should care

Defenders responsible for Governikus AusweisApp systems should assess exposure and prioritize upgrading to version 2.5.5 or later. Defenders should verify if systems are using vulnerable versions of Governikus AusweisApp. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Defenders should review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

Defenders should prioritize upgrading Governikus AusweisApp to version 2.5.5 or later to address the cross-site scripting vulnerability, which can lead to unauthorized actions on affected systems.

• Cross-site scripting attacks can lead to unauthorized actions on affected systems
• Defenders should verify if systems are using vulnerable versions of Governikus AusweisApp
• Upgrading to version 2.5.5 or later can prevent exploitation of this vulnerability

Technical summary

A weakness has been identified in Governikus AusweisApp up to 2.5.4, which can lead to cross-site scripting when manipulating the argument ResultMessage in the StartPAOSResponse Handler. The attack can be launched remotely. Defenders should prioritize upgrading Governikus AusweisApp to version 2.5.5 or later to address the cross-site scripting vulnerability. Upgrading to version 2.5.5 is able to address this issue. It is recommended to upgrade the affected component. Defenders responsible for Governikus AusweisApp systems should assess exposure and prioritize upgrading to version 2.5.5 or later.

Defensive priority

Defenders should prioritize upgrading Governikus AusweisApp to version 2.5.5 or later to address the cross-site scripting vulnerability.

Recommended defensive actions

• Upgrade Governikus AusweisApp to version 2.5.5 or later
• Review and update affected systems
• Monitor for potential cross-site scripting attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the vulnerability in Governikus AusweisApp up to 2.5.4, which can lead to cross-site scripting. Defenders should verify if systems are using vulnerable versions of Governikus AusweisApp and review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. The attack can be launched remotely. Upgrading to version 2.5.5 is able to address this issue.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.