Barracuda Networks Barracuda Email Security Gateway (ESG)

What it is

Barracuda Networks Email Security Gateway (ESG) contains an authentication bypass using an alternate path or channel that could allow 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. This vulnerability can be chained with CVE-2026-111560.

What to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Vendor notices and references

• trust.barracuda.com/security/pre-authentication-authorization-bypass-command-injection
• github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0042.md
• nvd.nist.gov/vuln/detail/CVE-2026-116606

Description and required action as published by CISA. Full record at NVD.