Authentication Bypass in Barracuda Email Security Gateway
CVE-2026-116606

9.3CRITICAL

Key Information:

Vendor

Barracuda Networks

Status
Barracuda Email Security Gateway (esg)
Vendor
CVE Published:
2 November 2026

What is CVE-2026-116606?

An authentication bypass vulnerability in the Barracuda Email Security Gateway versions prior to 9.4.0.030 permits unauthenticated remote attackers to invoke a critical configuration-import function. This exploit allows attackers to restore a meticulously crafted backup archive, leading to unauthorized alterations of the appliance's global settings, compromising security and operational integrity.

Affected Version(s)

Barracuda Email Security Gateway (ESG) 0 < 9.4.0.030

References

https://github.com/mandiant/Vulnerability-Disclosures/blo...
third-party-advisory
https://trust.barracuda.com/security/pre-authentication-a...
vendor-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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