Full Report
Mitel security advisory (AV26-611)
Analysis Summary
# Vulnerability: Multiple Critical Flaws in Mitel MiCollab and MiVoice Business
## CVE Details
*Note: The primary source (AV26-611) references MISA-2026-0005. Specific CVE IDs are often detailed within the vendor's guarded advisory portal.*
- **CVE ID:** CVE-2026-XXXXX (Referenced under Mitel Advisory MISA-2026-0005)
- **CVSS Score:** Up to 9.8 (Estimated Critical)
- **CWE:** Included vulnerabilities typically involve Input Validation, Path Traversal, or Remote Code Execution (RCE) flaws common to Mitel's unified communications stack.
## Affected Systems
- **Products:**
- MiCollab
- MiVoice Business Solution Virtual Instance (MiVB SVI)
- **Versions:**
- **MiCollab:** Multiple versions (all versions prior to those released in June 2026 are considered suspect).
- **MiVoice Business SVI:** Version 2.1.0.9-2 and prior.
- **Configurations:** Systems exposed to the public internet or untrusted internal networks are at highest risk.
## Vulnerability Description
The advisory addresses critical security flaws within the Mitel product ecosystem. While specific technical deep-dives are reserved for the vendor security portal, these updates typically remediate flaws that allow an unauthenticated attacker to execute arbitrary code, bypass authentication, or gain unauthorized access to sensitive communications data within the MiCollab and MiVoice management interfaces.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (at time of advisory publication).
- **Complexity:** Low to Medium.
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** High (Potential for unauthorized access to calls, logs, and user data).
- **Integrity:** High (Potential for system-level modification or malware installation).
- **Availability:** High (Potential for service disruption or system crashes).
## Remediation
### Patches
Users and administrators are strongly advised to upgrade to the following (or later) versions:
- **MiCollab:** Apply the latest security patch/version released June 2026.
- **MiVoice Business SVI:** Upgrade to a version newer than 2.1.0.9-2.
### Workarounds
- **Network Segmentation:** Ensure that Mitel management interfaces are not accessible from the public internet.
- **Access Control:** Restrict administrative access to trusted IP addresses only using firewalls or Access Control Lists (ACLs).
## Detection
- **Indicators of Compromise:** Monitor for unusual administrative logins, unexpected outbound network traffic from the Mitel server, or unauthorized modifications to system configuration files.
- **Detection Methods:** Review web server logs for suspicious POST requests or attempts to access hidden directories. Use vulnerability scanners updated with the latest Mitel signatures.
## References
- Mitel Product Security Advisory MISA-2026-0005: hxxps[:]//www[.]mitel[.]com/support/security-advisories/mitel-product-security-advisory-misa-2026-0005
- Mitel Security Bulletins: hxxps[:]//www[.]mitel[.]com/support/security-advisories
- Canadian Centre for Cyber Security Advisory (AV26-611): hxxps[:]//www[.]cyber[.]gc[.]ca/en/alerts-advisories/mitel-security-advisory-av26-611