Fireware OS Improper Authentication in AuthPoint MFA Verification Allows Session Hijacking

published 2026-10-27 13 d ago modified 2026-11-04 4 d ago also EUVD-2026-111155

cvss: 5.7; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

An improper authentication vulnerability in WatchGuard Fireware OS's AuthPoint multi-factor authentication process allows a local, unauthenticated attacker on the appliance to hijack another user's in-progress MFA session by supplying a specially crafted request and convincing the victim user to accept an MFA push notification.

Patch / fix

fixed in 1

WatchGuard Fireware OS 12.12.4, 2026.4

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 4 d ago (2026-11-04)

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.6	CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA	4.0	5.7	CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/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

Affected products

WatchGuard Fireware OS

Classification

Weakness

CWE-287 Improper Authentication
CWE-346 Origin Validation Error

References

psirt.watchguard.com /CVE-2026-82332
vendor-advisory

Sources

CVE List CVE-2026-82332
NVD CVE-2026-82332

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary