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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-21031 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-21031

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-21031 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-21031

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

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.