CVE-2026-86136

highpriority · track · 32OT risk · elevatedEPSS 0.003 · 22 %ileDENLUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.30% (22nd) EPSS

CVSS 8.1 · high

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cert_bund · ncsc_nl · nvd

EPSS · scored 2026-10-27

A missing authorization vulnerability in the wgagent management daemon's session initialization function allows an authenticated, low-privileged user (including a read-only or guest administrator account) to crash the wgagent process and read arbitrary files accessible to the daemon by submitting a specially crafted management API request.

cvss

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.1

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.2

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Hsecondary · NCSC-NL NL

v4.07.1highCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/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:Xsecondary

v4.05mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USCWE-22USCWE-476USCWE-862US

affected products (16)

Products and version ranges known to be affected.

WatchGuard Fireware OS <12.11.10all versionscert_bundDE
WatchGuard Fireware OS <12.12.3all versionscert_bundDE
WatchGuard Fireware OS <12.5.21all versionscert_bundDE
WatchGuard Fireware OS <2026.2.3all versionscert_bundDE
WatchGuard Fireware OS <2026.3.2all versionscert_bundDE
WatchGuard Fireware OS< 12.11.10cert_bundDE
WatchGuard Fireware OS< 12.12.3cert_bundDE
WatchGuard Fireware OS< 12.5.21cert_bundDE
WatchGuard Fireware OS< 2026.2.3cert_bundDE
WatchGuard Fireware OS< 2026.3.2cert_bundDE
WatchGuard Fireware≤ vers:unknown/*ncsc_nlNL
WatchGuard Fireware OS≤ vers:unknown/*ncsc_nlNL
watchguard fireware12.0 → 12.5.21nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
watchguard fireware12.12 → 12.12.3nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
watchguard fireware2025.0 → 2026.2.3nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*
watchguard fireware2026.3 → 2026.3.2nvdUScpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2026-0404Kwetsbaarheden verholpen in WatchGuard Fireware OSNL2026-10-07csaf · ncsc_nlNL
WatchGuard heeft meerdere kwetsbaarheden verholpen in Fireware OS.
WID-SEC-W-2026-3646WatchGuard Fireware OS: Mehrere SchwachstellenDeutsch2026-09-29csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in WatchGuard Fireware OS ausnutzen, um beliebigen Code auszuführen – einschließlich Code mit Root-Rechten –, Sicherheitsmaßnahmen zu umgehen, vertrauliche Daten offenzulegen oder zu manipulieren und Denial-of-Service-Zustände zu verursachen.

sources

Which sources assert this record, and when.

cert_bund ncsc_nl nvd NVD CVE.org MITRE

published 2026-09-30modified 2026-10-06

references (1) nvd

External citations — patches, advisories, analysis.

https://psirt.watchguard.com/CVE-2026-86136PatchVendor Advisory

scry

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