CVE-2026-116606: Barracuda Networks Email Security Gateway (ESG) Authentication Bypass Using an Alternate Path or Channel Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 8 days after the CVE record was published.
VulnCheck KEV lists it since , 1 day before CISA. It cites 3 public reports, the first from .
- How likely is exploitation in the next 30 days?
- 8.9%
EPSS score, percentile 95.3 of all scored records
- How severe?
- 9.3 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA (deadline ): Apply mitigations in accordance with vendor instructions … Full text
- Which versions are affected?
Affected
- before 9.4.0.030
Source: CISA KEV 2026.11.10, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
Authentication Bypass Allows Global Configuration Restore in Barracuda Email Security Gateway
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.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
Required action, set by CISA
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 due date for this action: .
Linked from CISA's catalog entry
- https://trust.barracuda.com/security/pre-authentication-authorization-bypass-command-injection
- https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0042.md
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- 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
This summary is based on the CVE record and CISA's catalog entry as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (1 product)
| Status | Versions |
|---|---|
| Affected | before 9.4.0.030 |
Versions not listed are: unaffected.
Source: CVE List, as of . About the data.
Weakness
CWE-288, 1 CAPEC
- CWE-288: Authentication bypass using an alternate path or channel
Attack patterns (CAPEC)
- CAPEC-115: Authentication Bypass
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CVE record last updated | |
| CISA due date for the required action |
References
1
More exploited Barracuda Networks vulnerabilities
- CVE-2026-111560: Barracuda Networks Multiple Products OS Command Injection Vulnerability
- CVE-2023-2868: Barracuda Networks ESG Appliance Improper Input Validation Vulnerability