CVE-2026-21061 describes an improper input validation vulnerability in Samsung Dialer software before the SMR Aug-2026 Release 1 update. This vulnerability permits remote attackers to access SIM-related functions on affected devices. Exploitation requires user interaction, indicating that an attacker must convince a user to perform some action to trigger the flaw. There is no indication of active exploitation in the wild or known exploits. The vulnerability has a moderate severity rating and no cloud service involvement.

Successful exploitation could allow remote attackers to access SIM-related functions on the device, potentially leading to unauthorized SIM operations. However, exploitation requires user interaction, which limits the risk. There are no reports of active exploitation or known exploits in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vulnerability affects Samsung Dialer prior to SMR Aug-2026 Release 1, updating to this or a later release is likely the intended fix once available. Until then, users should exercise caution with unsolicited interactions involving the dialer application.