CVE-2026-86105

Fireware OS Improper Authorization in Access Portal Reverse Proxy

MEDIUM 5.3

At a glance

Source: NVD
EPSS: EPSS 0.31 % · percentile 24 (2026-10-28)
State: PUBLISHED
Published: 2026-09-29 23:05 UTC
Updated: 2026-09-30 15:28 UTC
Assigner: WatchGuard
NVD status: Analyzed

Description

An improper authorization vulnerability in Fireware OS's Access Portal reverse proxy allows an authenticated, low-privileged Access Portal user to access other web applications they are not authorized for by sending a specially crafted request for a different resource which they are authorized to access.

Weaknesses (CWE)

CWE-176
CWE-22 — Path Traversal
CWE-285 — Improper Authorization

References

https://psirt.watchguard.com/CVE-2026-86105

Scores

Version	Score	Vector	Scored by
CVSS 4.0	MEDIUM 5.3	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N	WatchGuard
CVSS 4.0	MEDIUM 6.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/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	NVD · 5d1c2695-1a31-4499-88ae-e847036fd7e3 (Secondary)
CVSS 3.1	HIGH 7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2026-89492
GCVE · GCVE-0-2026-86105

Affected configurations (NVD CPE)

cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 12.0 < 12.5.21
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 12.12 < 12.12.3
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 2025.0 < 2026.2.3
cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:* ≥ 2026.3 < 2026.3.2

Affected products

Product	Versions
WatchGuard · Fireware OS	affected 2026.3 < 2026.3.2 ; affected 2025.0 < 2026.2.3 ; affected 12.0 < 12.12.3
WatchGuard · Fireware OS	affected 12.0 < 12.5.21

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD