CVE-2026-21131 Samsung Mobile CVE debrief

Who should care

Defenders responsible for managing and securing Samsung Flow installations should be aware of this vulnerability and take steps to verify and update the software as necessary.

Why it matters

CVE-2026-21131 is a low-severity vulnerability in Samsung Flow that requires verification and potential updates to prevent exploitation.

• Defenders should verify the version of Samsung Flow installed on devices to prevent potential exploitation.
• Local attackers may be able to launch arbitrary activities with Samsung Flow privileges if the software is not updated.

Technical summary

The vulnerability is caused by incorrect default permissions in Samsung Flow prior to version 4.9.22.4, allowing local attackers to launch an arbitrary activity with Samsung Flow privileges on the connected device. This issue requires verification and potential updates to prevent exploitation. The CVE record and source item provide limited information about the vulnerability, but it appears that the issue is related to incorrect default permissions in Samsung Flow. Defenders should prioritize verifying the version of Samsung Flow installed on devices and ensuring

Defensive priority

Defenders should prioritize verifying the version of Samsung Flow installed on devices and ensuring that it is updated to version 4.9.22.4 or later.

Recommended defensive actions

• Verify the version of Samsung Flow installed on devices and ensure that it is updated to version 4.9.22.4 or later.
• Monitor for any suspicious activity related to Samsung Flow on connected devices.
• 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.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide limited information about the vulnerability, but it appears that the issue is related to incorrect default permissions in Samsung Flow.

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.