What is CVE-2026-21086?

CVE-2026-21086 is a high-severity vulnerability in Samsung Android, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2026-09-09.

How severe is CVE-2026-21086?

High severity. CVSS v3 base score is 7.8 out of 10.

Improper input validation in Samsung Android

CVE-2026-21086

Improper authorization in ProxyHandler prior to SMR Aug-2026 Release 1 allows local attackers to access proxy configuration.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-09-09 · last modified 2026-09-28.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.3th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Samsung Android — versions 14.0, 15.0, 16.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2026-21086?: CVE-2026-21086 is a high-severity vulnerability in Samsung Android, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2026-09-09.
How severe is CVE-2026-21086?: High severity. CVSS v3 base score is 7.8 out of 10.