CVE-2026-21059 Samsung Mobile CVE debrief

Who should care

Users of Samsung devices with vulnerable versions of Samsung Contacts should prioritize applying the security update to prevent potential local attacks. This includes operators managing Samsung devices, platform administrators, vulnerability management teams, and security teams responsible for monitoring and defending against potential exploits. Ensure that all relevant parties are aware of the vulnerability and take necessary actions to mitigate the risk.

Technical summary

CVE-2026-21059 is a MEDIUM severity vulnerability in Samsung Contacts, allowing local attackers to delete files with Samsung Contacts' privilege due to improper export of android application components. This vulnerability affects Samsung devices with vulnerable versions of Samsung Contacts prior to SMR Aug-2026 Release 1. Local attackers may exploit this vulnerability to delete files with Samsung Contacts' privilege. Defenders should verify the affected scope, including potentially exposed assets and systems, and review system logs for suspicious activity related to Samsung Contacts.

Defensive priority

Local attackers may exploit improper export of android application components in Samsung Contacts to delete files with Samsung Contacts' privilege; verify and apply vendor remediation.

Recommended defensive actions

• Verify Samsung Contacts application version and ensure it is up-to-date
• Apply Samsung's security update for August 2026 or later
• Monitor system logs for suspicious activity related to Samsung Contacts

Evidence notes

The CVE record indicates improper export of android application components in Samsung Contacts prior to SMR Aug-2026 Release 1; Samsung's security update page may provide further details. However, due to limited source detail, defenders should verify the affected scope, including potentially exposed assets and systems, and review system logs for suspicious activity related to Samsung Contacts. Additionally, verify and apply vendor remediation as necessary.

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.