CVE-2026-21118 Samsung Mobile CVE debrief

Who should care

Defenders responsible for Samsung Mobile Devices' security, particularly those managing software updates and vulnerability remediation, should assess exposure and prioritize applying the October 2026 security update.

Why it matters

CVE-2026-21118 is a medium-severity vulnerability in Samsung Mobile Devices' DownloadProvider, allowing local attackers to access files in scoped storage prior to SMR Oct-2026 Release 1. Defenders should prioritize verifying and applying the October 2026 security update to prevent potential local file access.

• Potential unauthorized local file access
• Need to verify and apply security updates
• Possible impact on scoped storage security

Technical summary

The vulnerability is due to improper access control in DownloadProvider prior to SMR Oct-2026 Release 1, allowing local attackers to access files in scoped storage. The vulnerability affects Samsung Mobile Devices with DownloadProvider prior to SMR Oct-2026 Release 1. The CVSS score is 6.9 and the severity is MEDIUM. Defenders should prioritize verifying and applying the October 2026 security update to prevent potential local file access.

Defensive priority

Defenders should prioritize verifying and applying the October 2026 security update for Samsung Mobile Devices to prevent potential local file access.

Recommended defensive actions

• Verify and apply the October 2026 security update for Samsung Mobile Devices
• Review and update affected Samsung Mobile Devices' software versions
• Monitor for potential local file access attempts

Evidence notes

The CVE record and source item provide details on the improper access control vulnerability in DownloadProvider prior to SMR Oct-2026 Release 1. The vulnerability allows local attackers to access files in scoped storage. The source item provides CVE-2026-21118 details. The CVE Program record with source-provided CVE metadata is available. The official NIST NVD detail page and source-specific vulnerability assessment are also available. Defenders should verify and apply the October 2026

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.