CVE-2026-116606
Authentication Bypass Allows Global Configuration Restore in Barracuda Email Security Gateway
Updated
- CVSS 4.0
- 9.3 CRITICAL
- EPSS
- 8.9% (95th pct)
- CISA KEV
- Exploited
- Published
- 2026-11-02
- Weakness
- CWE-288
Barracuda Networks Email Security Gateway (ESG) Authentication Bypass Using an Alternate Path or Channel Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
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.
CISA notes
https://trust.barracuda.com/security/pre-authentication-authorization-bypass-command-injection ; https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0042.md ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-116606
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.
Key Findings
as of 2026-11-12- CISA added CVE-2026-116606 to the KEV catalog 8 days after its CVE record was published. The median for entries added in 2026 so far is 12 days.
- It is one of 3 Barracuda Networks entries in the CISA KEV catalog, and one of 2 added in 2026.
- Its current EPSS score (8.9%) is higher than that of 23% of CISA KEV entries.
Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NOpen in CVSS calculator Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Barracuda Networks | Barracuda Networks Barracuda Email Security Gateway (ESG) | 0 to <9.4.0.030 |
References
2 linksRecord Details
- Published
- 2026-11-02
- Last updated
- 2026-11-11
- Assigner (CNA)
- Mandiant
- Credited to
- -
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