Mitel MiCollab Path Traversal (CVE-2024-55550)

Historical catalog analysis: CISA added this entry on January 07, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2024-55550 is a path traversal vulnerability (CWE-22) affecting Mitel MiCollab. The flaw stems from insufficient input sanitization, which allows an authenticated attacker with administrative privileges to read local files on the system.

Of critical importance to vulnerability management teams is the chainability of this flaw. When combined with CVE-2024-41713, the requirement for authentication and administrative privileges is bypassed, potentially allowing an unauthenticated remote attacker to read arbitrary files from the server. This specific combination has been identified as being used in known ransomware campaigns.

Exposure and applicability

This vulnerability applies to organizations deploying Mitel MiCollab. The exposure profile differs based on whether CVE-2024-41713 is also present:

• Isolated CVE-2024-55550: Risk is limited to authenticated users with administrative access.
• Chained Exposure: If both vulnerabilities are present, the system is exposed to unauthenticated remote attackers.

Infrastructure owners should prioritize assets that are internet-facing or reside in segments where unauthenticated network access is possible.

Remediation priorities

Based on the reported exploitation by ransomware actors, we analyze the following priority sequence for reducing exposure:

1. Immediate Mitigation Application: Apply vendor-provided mitigations as specified in the official security advisory. If mitigations are unavailable for a specific deployment, the source suggests discontinuing use of the product.
2. Chain Analysis: Specifically verify the status of CVE-2024-41713. Because the combination of these two flaws elevates the risk from an internal administrative threat to an unauthenticated remote threat, remediating both is essential for reducing the external attack surface.
3. Access Control Review: While not a primary fix for the path traversal, restricting administrative access and auditing existing admin accounts could reduce the likelihood of exploitation if only CVE-2024-55550 is present.

How to validate remediation

Verification must move beyond confirming a version number or the presence of a patch. To assure that exposure has been reduced, defenders should seek evidence of the following:

• Configuration Audit: Verify that the specific input sanitization controls recommended by the vendor are active and enforced.
• Functional Testing: In a non-production environment, attempt to access files outside the intended directory using path traversal sequences to confirm the mitigation blocks these requests.
• Chain Verification: Confirm that the conditions required for CVE-2024-41713 have been neutralized, as this removes the primary vector for unauthenticated remote exploitation of CVE-2024-55550.

Limits and open questions

Applying a patch or mitigation may reduce the likelihood of exploitation but does not guarantee total immunity from similar path traversal variants. Residual risk remains if other unauthenticated entry points exist that could be chained with this flaw in ways not yet documented. Furthermore, the source does not specify the exact files accessible via this vulnerability; therefore, defenders must assume any local system file could be targeted.

Source and editorial note

CVE-2024-55550: Mitel MiCollab Path Traversal Vulnerability · Source date: January 07, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: January 10, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 29, 2026 at 00:20 UTC.

Request a Vulnerability Assessment