CVE-2026-21058 Samsung Mobile CVE debrief

Who should care

Users of Samsung Contacts, administrators of Samsung devices, security teams responsible for patch management, vulnerability remediation, and system monitoring. Ensure that all relevant personnel are aware of the potential risks and take necessary precautions to protect sensitive data and systems. This includes verifying affected versions, applying patches, and monitoring system logs for suspicious activity.

Technical summary

CVE-2026-21058 is a medium-severity vulnerability in Samsung Contacts due to improper input validation, allowing local attackers to delete files with Samsung Contacts' privileges. The vulnerability affects Samsung Contacts prior to SMR Aug-2026 Release 1. Local attackers may exploit this vulnerability to delete files with elevated privileges. Verify and apply vendor patches to mitigate the vulnerability. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity.

Defensive priority

Local attackers may exploit improper input validation in Samsung Contacts to delete files with elevated privileges; verify and apply vendor patches.

Recommended defensive actions

• Verify Samsung Contacts version and apply SMR Aug-2026 Release 1 or later
• Restrict local access to sensitive data and systems
• Monitor system logs for suspicious activity

Evidence notes

The CVE record indicates improper input validation in Samsung Contacts prior to SMR Aug-2026 Release 1. Verify affected versions and apply patches. Samsung Contacts' privilege elevation allows local attackers to delete files. Evidence is limited; verify with vendor advisories and monitor for suspicious activity. Check system logs for potential exploitation attempts and ensure patch deployment.

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.