Vulnerability · Published Nov 2, 2026 · Assigned by Mandiant

CVE-2026-116606Authentication Bypass Allows Global Configuration Restore in Barracuda Email Security Gateway

Critical 9.3

In plain English

A critical-severity authentication bypass in Barracuda Email Security Gateway (ESG) from Barracuda Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.7%top 45.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Public PoC

Official description

An authentication bypass in Barracuda Email Security Gateway versions earlier than 9.4.0.030 allows an unauthenticated remote attacker to invoke a configuration-import function and restore a crafted, compatible backup archive, resulting in unauthorized modification of the appliance’s global configuration.

Affected products (as reported)

Vendor	Product	Versions
Barracuda Networks	Barracuda Email Security Gateway (ESG)	0 – before 9.4.0.030

Weakness: CWE-288 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0042.md third-party-advisory
https://trust.barracuda.com/security/pre-authentication-authorization-bypass-command-injection vendor-advisory