Exploited vulnerabilities / CVE-2026-116606
Confirmed exploited · authentication bypass · Barracuda Email Security Gateway (ESG)CVE-2026-116606
Barracuda Email Security Gateway (ESG) authentication bypass, confirmed exploited in the wild.
Barracuda Networks Email Security Gateway (ESG) contains an authentication bypass using an alternate path or channel that could allow 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. This vulnerability can be chained with CVE-2026-111560.
| CISA's name for it | Barracuda Networks Email Security Gateway (ESG) Authentication Bypass Using an Alternate Path or Channel Vulnerability |
|---|---|
| Vendor and product | Barracuda Networks · Barracuda Email Security Gateway (ESG) |
| Type | authentication bypass · CWE-288 |
| Exploited | Confirmed by CISA listed 10 November 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 13 November 2026 · today |
| Used in ransomware | Not reported |
| Advisories | trust.barracuda.com ↗ · github.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ |
Three steps, in this order
Apply the vendor fix and restart the affected service.
Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant.
Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
| 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
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Know before someone else finds it
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CVE-2026-116606 in short
Is CVE-2026-116606 being exploited?
Yes. CISA added CVE-2026-116606 to its Known Exploited Vulnerabilities catalogue on 10 November 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-116606?
US federal agencies must remediate it by 13 November 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-116606 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 8.9%, the 95th percentile of every CVE it scores.
How do I fix CVE-2026-116606?
Apply the vendor fix and restart the affected service. Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant. Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.
Other Barracuda Networks vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-111560 | Multiple Products | command injection | 10 November 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.