CVE-2026-93866

CRITICAL 9.2CVE-2026-93866 · Published 27/10/2026 · updated 28/10/2026

In short

CVE-2026-93866 is a CRITICAL (CVSS 9.2) vulnerability.
Chance of exploitation in the next 30 days (EPSS): 0.45%, higher than 39.0% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
—	No affected product versions are listed for this vulnerability yet.

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.

References

psirt.watchguard.com/CVE-2026-93866

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