Link Following Vulnerability in WatchGuard Fireware OS
CVE-2026-93864

7.1HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-93864?

A vulnerability exists in the WatchGuard Fireware OS’s firewall daemon that enables a local attacker, possessing code execution abilities as a low-privileged system process, to overwrite arbitrary files with root privileges. This issue arises due to a flaw in the handling of crafted file system objects, allowing for exploitation through tampering with firewall IP set data by triggering a list update. The impact of this vulnerability may result in significant risks to system integrity and security.

Affected Version(s)

Fireware OS Default 2025.1 < 2026.4

Fireware OS Default 12.0 < 12.12.4

Fireware OS T15/T35 12.0 < 12.5.22

References

https://psirt.watchguard.com/CVE-2026-93864
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WatchGuard AI Security Research
.