CVE-2026-93864
High
Description
A link following vulnerability in WatchGuard Fireware OS’s firewall daemon allows a local attacker with code execution as a low-privileged system process to overwrite arbitrary files with root privileges, and to tamper with firewall IP set data, by planting a crafted file system object and triggering a list update. Written content is partially constrained.
SeverityHigh
CVSS7.1
Exploit probability—
ProductFireware OS
PublishedOct 27, 2026
First seenOct 27, 2026
How to fix
Update
- WatchGuard Fireware OS2026.4, 12.12.4, 12.5.22 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| WatchGuard Fireware OS | 2025.1 ≤ v < 2026.4, 12.0 ≤ v < 12.12.4, 12.0 ≤ v < 12.5.22 | 2026.4, 12.12.4, 12.5.22 |
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