Critical severity · published Oct 27, 2026
CVE-2026-93865
Fireware OS Missing Authentication in FireCluster Sync Daemon Allows Remote Root Action Injection
New
9.2
CVSS
0.5%
EPSS
No
On KEV
Description
A missing authentication vulnerability in the Fireware OS FireCluster synchronization daemon allows a remote, unauthenticated attacker to invoke privileged system-level administrative actions by sending a specially crafted request to the FireCluster management IP when the clustering feature is enabled.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fireware OS · WatchGuard
2025.1 before 2026.4; 12.0 before 12.12.4; 12.0 before 12.5.22 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93865
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93865
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2026-93865
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