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CVE-2026-21031 Samsung Mobile CVE debrief

CVE-2026-21031 is a medium-severity vulnerability in Samsung's AppBlock, which allows local attackers to launch arbitrary activity. The vulnerability requires user interaction to trigger and has a CVSS score of 5.2.

Vendor
Samsung Mobile
Product
Samsung Mobile Devices
CVSS
MEDIUM 5.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-06
Advisory published
2026-06-05
Advisory updated
2026-06-06

Who should care

Users of Samsung devices with AppBlock installed prior to SMR Jun-2026 Release 1 should apply the patch to prevent local attackers from launching arbitrary activity.

Technical summary

The vulnerability is caused by improper authorization in AppBlock. A local attacker can exploit this vulnerability to launch arbitrary activity, but user interaction is required.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patch: Samsung has released a patch for this vulnerability as part of SMR Jun-2026 Release 1. Users can update their devices to this release or later to fix the issue. [ref-4]

Evidence notes

CVE-2026-21031 was published on 2026-06-05T11:16:35.673Z and modified on 2026-06-06T01:59:53.273Z. The vulnerability affects multiple versions of Samsung Android, including Android 15.0 and 16.0.

Official resources

CVE-2026-21031 was published on 2026-06-05T11:16:35.673Z and modified on 2026-06-06T01:59:53.273Z.