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CVE-2026-93866

Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write

CRITICAL
9.2
CVSS Score
Published: October 27, 2026 at 03:52 PM UTC
Updated: October 28, 2026 at 02:39 PM UTC
1 product affected across 1 vendorFireware

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Severity
CRITICAL9.2
Exploit prediction
EPSS 0.4%

Description

An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://psirt.watchguard.com/CVE-2026-93866

CVSS

9.2CRITICALWatchGuard
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-190CWE-288CWE-787

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