CVE-2026-93866

Published Oct 27, 2026 CWE-190 CWE-288 CWE-787

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.

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Weakness Type (CWE)

CWE-190 Integer Overflow
CWE-288 CWE-288
CWE-787 Out-of-bounds Write

References

Frequently Asked Questions

What is CVE-2026-93866? +
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.
How do I check if I'm vulnerable to CVE-2026-93866? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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