---
title: "CVE-2026-21157: Bixby - Improper Input Validation"
description: "Bixby < 4.0.85.6 contains an improper input validation vulnerability allowing privileged local attackers to launch arbitrary activity, exploit requires local privileged access."
url: https://panop.io/threat-heartbeat/CVE-2026-21157/
---

# CVE-2026-21157 Bixby - Improper Input Validation

Bixby < 4.0.85.6 contains an improper input validation vulnerability allowing privileged local attackers to launch arbitrary activity, exploit requires local privileged access.

CVSS base score 8.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-21157)

## Details

Type

Improper Input Validation

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

29 October 2026

Updated

29 October 2026

## Vendor fix

Update to version 4.0.85.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-21157](https://nvd.nist.gov/vuln/detail/CVE-2026-21157)
- [https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=07](https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=07)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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