# CVE-2026-21055 — Samsung Mobile Bixby

> As of 2026-08-05, CVE-2026-21055 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Samsung Mobile Bixby, CVSS v4.0 8.5, EPSS 0.1% (5.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-21055, most recently “Samsung Bixby Exploit Chain — System-Level RCE via Samsung Members, Samsung Account, and Capsule Bypass (CVE-2025-21079, CVE-2025-58486, CVE-2025-58487)”.

**Last updated:** 2026-08-05

## What is CVE-2026-21055?

Improper export of android application components in Bixby prior to version 4.0.70.8 allows local attackers to execute arbitrary commands with Bixby privilege.

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 126 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 8.5 — High (derived from score) (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 5.6% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-10

## Is CVE-2026-21055 being exploited?

Weaponised exploit code for CVE-2026-21055 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 21 in the Threadlinqs vulnerability feed.

- [Hunt-Benito/samsung-bixby-command-execution-cve-2026-21055-improper-component-export](https://github.com/Hunt-Benito/samsung-bixby-command-execution-cve-2026-21055-improper-component-export) (github)

## Affected products and versions

- [Samsung Mobile](https://intel.threadlinqs.com/vendors/samsung-mobile): Bixby

## How to fix CVE-2026-21055

No vendor patch reference has been recorded for CVE-2026-21055 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-21055

1 tracked threat in the Threadlinqs corpus references CVE-2026-21055, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Samsung Bixby Exploit Chain — System-Level RCE via Samsung Members, Samsung Account, and Capsule Bypass (CVE-2025-21079, CVE-2025-58486, CVE-2025-58487)](https://intel.threadlinqs.com/threat/TL-2026-1901) — CRITICAL · 2026-08-05

## Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories.

**Other references**

- [security.samsungmobile.com](https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=07)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-21055
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