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Vulnerability record · CVE-2026-116606 · published 2 November 2026

CVE-2026-116606: Barracuda email security gateway 300 firmware authentication bypass via alternate path vulnerability

Barracuda · Email Security Gateway 300 Firmware

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.

9.3 CVSS 4.0 Critical CISA KEV since 10 Nov 2026 EPSS 8.9% · top 4.7% CWE-288 · Authentication bypass via alternate path
9.3CVSS 4.0 base score
8.9%EPSS exploitation probability, 30 days
YesIn CISA KEV, federal fix due in 0 days
5Affected product versions listed by NVD
3References
12 Nov 2026Last modified by NVD

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.

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:

Exploitation in the wild

CISA added CVE-2026-116606 to the Known Exploited Vulnerabilities catalog on 10 November 2026 as "Barracuda Networks Email Security Gateway (ESG) Authentication Bypass Using an Alternate Path or Channel Vulnerability". 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. Federal deadline 13 November 2026.

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/mandiant/Vulnerability-Disclosures/blob/master/2026/MNDT-2026-0042.md Third Party Advisory
https://trust.barracuda.com/security/pre-authentication-authorization-bypass-command-injection Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-116606 US Government Resource

Track CVE-2026-116606 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-116606), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.