# CVE-2026-57909 — WatchGuard Agent

> As of 2026-08-26, CVE-2026-57909 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in WatchGuard Agent, CVSS v4.0 9.4, EPSS 0.2% (20.9th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-57909, most recently “Critical WatchGuard Agent for Windows Flaws (CVE-2026-57910, CVE-2026-57909) Enable Unauthenticated SYSTEM-Level RCE”.

**Last updated:** 2026-08-26

## What is CVE-2026-57909?

A path traversal vulnerability in WatchGuard Agent allows a remote, unauthenticated attacker on an adjacent network to execute arbitrary code on an affected system.

The record classifies CVE-2026-57909 under weakness classes [CWE-306](https://intel.threadlinqs.com/cwe/CWE-306), [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 41 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 9.4 — Critical (derived from score) (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 20.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-25, last modified 2026-08-26

## Is CVE-2026-57909 being exploited?

No public exploitation evidence for CVE-2026-57909 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-26. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- [WatchGuard](https://intel.threadlinqs.com/vendors/watchguard): Agent

## How to fix CVE-2026-57909

No vendor patch reference has been recorded for CVE-2026-57909 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-2026-57909

1 tracked threat in the Threadlinqs corpus references CVE-2026-57909, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Critical WatchGuard Agent for Windows Flaws (CVE-2026-57910, CVE-2026-57909) Enable Unauthenticated SYSTEM-Level RCE](https://intel.threadlinqs.com/threat/TL-2026-2162) — CRITICAL · 2026-08-27

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-27. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [psirt.watchguard.com — vendor advisory](https://psirt.watchguard.com/CVE-2026-57909)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-57909
Full detection coverage and IOCs for threats exploiting CVE-2026-57909 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp