How severe is CVE-2026-111560?

No CVSS score has been assigned to CVE-2026-111560 yet. Review the advisory details and affected package list to assess your exposure.

Which products are affected by CVE-2026-111560?

CVE-2026-111560 affects the following products: Barracuda Networks Barracuda Email Security Gateway (ESG), Barracuda Networks Barracuda Load Balancer Application Delivery Controller (ADC), Barracuda Networks Barracuda Web Application Firewall (WAF), Barracuda Networks Barracuda Web Security Gateway (WSG), Barracuda Networks Barracuda Message Archiver (BMA), Barracuda Networks Barracuda WAF Control Center (WCC).

How do I patch CVE-2026-111560?

The records we use list no fixed version for CVE-2026-111560 (versions up to 9.4.0.27 are affected). Check the Barracuda Networks Barracuda Email Security Gateway (ESG) advisory for a patched release, and apply the workarounds below until you can upgrade.

How do I detect CVE-2026-111560 across my infrastructure?

Inventory every Barracuda Networks Barracuda Email Security Gateway (ESG) deployment and check each version against the affected-products list above.

How do I mitigate CVE-2026-111560 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2026-111560 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-111560 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-111560?

CVE-2026-111560 has an EPSS (Exploit Prediction Scoring System) score of 1.1%, placing it in the 65th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2026-111560 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2026-111560 (Barracuda Networks Multiple Products OS Command Injection Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-11-10. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-11-13. The required action was: 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. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2026-111560?

CVE-2026-111560 is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2026-111560?

CVE-2026-111560 affects Barracuda Networks Barracuda Email Security Gateway (ESG) (1 version, e.g. 0); Barracuda Networks Barracuda Load Balancer Application Delivery Controller (ADC) (1 version, e.g. 0); Barracuda Networks Barracuda Web Application Firewall (WAF) (1 version, e.g. 0); Barracuda Networks Barracuda Web Security Gateway (WSG) (1 version, e.g. 0), and 2 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2026-111560 published, and has it been updated?

CVE-2026-111560 was published on November 2, 2026 and was last updated on November 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV · ACTIVELY EXPLOITED

CVE-2026-111560 — Barracuda Email Security Gateway (ESG)

CVE-2026-111560 is a OS Command Injection vulnerability in Barracuda Networks Barracuda Email Security Gateway (ESG). It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-11-10) — treat it as actively exploited and patch now. Versions up to 9.4.0.27 are affected; the records list no fixed version yet, so check the vendor advisory below.

Improper neutralization of shell metacharacters in the timezone configuration field in certain Barracuda appliance products using common Barracuda code allows an authenticated administrator…

Published

Nov 2, 2026

Updated

Nov 10, 2026

Affected

6 products

Patched

See advisory

Exploits

None indexed

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-11-10. Federal agencies were required to remediate by 2026-11-13.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-111560.

EPSS Exploitation Probability

via FIRST.org ↗

1.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs65th percentile — riskier than 65% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Description

Improper neutralization of shell metacharacters in the timezone configuration field in certain Barracuda appliance products using common Barracuda code allows an authenticated administrator to inject OS commands that execute with root privileges when the crafted timezone value is subsequently processed.

Affected Products

6 products · 6 configurations

Application

Barracuda Email Security Gateway (ESG)Barracuda Networks

≤ 9.4.0.27

1 version

Application

Barracuda Load Balancer Application Delivery Controller (ADC)Barracuda Networks

≤ 6.4.0

1 version

Application

Barracuda Web Application Firewall (WAF)Barracuda Networks

≤ 11.0.1

1 version

Application

Barracuda Web Security Gateway (WSG)Barracuda Networks

≤ 16.1.100.100

1 version

Application

Barracuda Message Archiver (BMA)Barracuda Networks

≤ 5.5.4.0

1 version

Application

Barracuda WAF Control Center (WCC)Barracuda Networks

≤ 2.2.1

1 version

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every Barracuda Networks Barracuda Email Security Gateway (ESG) deployment and check each version against the affected-products list above.
Remediation status
The records we use list no fixed version for CVE-2026-111560 (versions up to 9.4.0.27 are affected). Check the Barracuda Networks Barracuda Email Security Gateway (ESG) advisory for a patched release, and apply the workarounds below until you can upgrade.
Mitigate without a patch
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

O3 Security · Runtime Protection

Is CVE-2026-111560 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works

CVE-2026-111560 — Barracuda Email Security Gateway (ESG)

Exploitation Status

Actively exploited in the wild

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

Frequently Asked Questions

Is CVE-2026-111560 being exploited in your environment?