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Public proof of conceptFix available

CVE-2026-13043

WatchGuard Endpoint Security Missing Authentication in Kernel Memory Access Driver Allows Arbitrary Kernel Memory Access

A public proof of concept exists; no exploitation attested.

  • Published2026-10-01
  • Fixed in8.00.26.0012
  • WeaknessCWE-306 · CWE-798

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A missing authentication vulnerability in the Kernel Memory Access Driver (PSKMAD) used by WatchGuard endpoint security products allows a local, authenticated attacker to bypass the driver's access-control handshake and issue arbitrary privileged commands to the driver, resulting in disclosure of kernel and process memory.

Timeline

dates in UTC
  1. 2026-10-0117:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-13043?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-13043?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Watchguard endpoint securityversion to verify
BranchAffectedFixed in
8.0< 8.00.26.00128.00.26.0012

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Watchguard endpoint security to 8.00.26.0012

Advisories and patches

Detection

read 2026-10-23 19:24 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedTheMalwareGuardian/CVE-2026-13043
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-10-01
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.09.3read 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • CNAweakness (CWE)CWE-306, CWE-798read 2026-10-23
  • FIRST EPSSEPSS score0.1 %2026-10-23
  • PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
2026-10-01
Last Modified
2026-10-16
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-13043?

A missing authentication vulnerability in the Kernel Memory Access Driver (PSKMAD) used by WatchGuard endpoint security products allows a local, authenticated attacker to bypass the driver's access-control handshake and issue arbitrary privileged commands to the driver, resulting in disclosure of kernel and process memory.

Is CVE-2026-13043 actively exploited?

Active exploitation of CVE-2026-13043 has not been confirmed. Its EPSS score was 0.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-13043?

CVE-2026-13043 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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