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CVE-2026-116606

9.3, critical Known exploited

Barracuda Networks Email Security Gateway (ESG) Authentication Bypass Using an Alternate Path or Channel Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.3, critical critical CVSS v4.0
EPSS, next 30 days
2% higher than 76% of scored CVEs
Exploitation
Confirmed in the wild
Published
2 Nov 20269 days ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 10 Nov 2026. US federal agencies must remediate by 13 Nov 2026.

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.

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.

Details

Vendor
Barracuda Networks
Product
Barracuda Email Security Gateway (ESG)
Weakness
CWE-288 (opens in a new tab)
Status
Undergoing analysis
Updated
10 Nov 2026
Assigner
mandiant-cve@google.com

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

References 3

Advisories 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Barracuda Networks CVEs

Every Barracuda Networks CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-111560 Barracuda Networks Multiple Products OS Command Injection Vulnerability KEV EPSS 1% 8.6, high
  • CVE-2023-2868 Barracuda Networks ESG Appliance Improper Input Validation Vulnerability KEV EPSS 87% 9.8, critical

Beyond this page

Is CVE-2026-116606 in your network?

This page tells you how dangerous CVE-2026-116606 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-116606 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-116606 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 11 Nov 2026, not the live upstream state.