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CVE-2026-116606

Authentication Bypass Allows Global Configuration Restore in Barracuda Email Security Gateway

  • Critical 9.3
  • Exploited: added to CISA KEV 10 Nov 2026

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 facts

Published
2 Nov 2026
Last changed
11 Nov 2026
Assigned by
Mandiant
KEV added
10 Nov 2026
KEV fix due
13 Nov 2026
EPSS
10.947% likely to be exploited in the next 30 days, higher than 95.956% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.3CVSS 4.0, Criticalfrom the CNA (Mandiant)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

What 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-115 Authentication Bypass (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
Barracuda NetworksBarracuda Email Security Gateway (ESG)
  • Default status: unaffected
  • 0 up to but excluding 9.4.0.030 (affected)

Timeline

  1. 2 Nov 2026 Published
  2. 10 Nov 2026 CVE-2026-116606 added to CISA KEV
  3. 10 Nov 2026 Added to the CISA KEV catalogue

Weakness

Related coverage

References