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Known exploited vulnerability

CVE-2026-116606

criticalCVSS 4.0 9.3In CISA KEVEPSS 1.6%Published · Barracuda Networks

The short answer

CVE-2026-116606 affects Barracuda Networks Barracuda Email Security Gateway (ESG) and is rated critical (CVSS 9.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-11-10: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-288.

Severity

9.3 critical

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploited (CISA KEV)

Yes, since Nov 10, 2026

Federal due date Nov 13, 2026

EPSS, next 30 days

1.6%

Higher than 76% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says 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…

Affected products

Barracuda Email Security Gateway (ESG). NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-116606 being exploited?

Yes. CISA added CVE-2026-116606 to its Known Exploited Vulnerabilities catalog on 2026-11-10, with a federal remediation due date of 2026-11-13.

How do I fix CVE-2026-116606?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Undergoing Analysis. The description is NVD's text, quoted as published.

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