VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 25 March 2022Ransomware use: unknown
Mitel MiCollab, MiVoice Business Express

CVE-2022-26143: MiCollab, MiVoice Business Express Access Control Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 25 Mar 2022, 16 days after the CVE record was published.

How likely is exploitation in the next 30 days?
87.3%

EPSS score, percentile 99.8 of all scored records

How severe?
9.8 Critical

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 15 Apr 2022. Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: 15 April 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

A vulnerability has been identified in MiCollab and MiVoice Business Express that may allow a malicious actor to gain unauthorized access to sensitive information and services, cause performance degradations or a denial of service condition on the affected system.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2022-26143 to its Known Exploited Vulnerabilities (KEV) catalog on 25 Mar 2022.
  • CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
  • The due date CISA sets for the required action is 15 Apr 2022.
  • The CVE record was published on 9 Mar 2022, 16 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 87.3% (percentile 99.8), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

The TP-240 (aka tp240dvr) component in Mitel MiCollab before 9.4 SP1 FP1 and MiVoice Business Express through 8.1 allows remote attackers to obtain sensitive information and cause a denial of service (performance degradation and excessive outbound traffic). This was exploited in the wild in February and March 2022 for the TP240PhoneHome DDoS attack.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
9 Mar 2022CVE record published
25 Mar 2022Added to CISA KEV
15 Apr 2022CISA due date for the required action
21 Oct 2025CVE record last updated

References

More exploited Mitel vulnerabilities

  • CVE-2024-41710: Mitel SIP Phones Argument Injection Vulnerability (added 12 Feb 2025)
  • CVE-2024-41713: Mitel MiCollab Path Traversal Vulnerability (added 7 Jan 2025)
  • CVE-2024-55550: Mitel MiCollab Path Traversal Vulnerability (added 7 Jan 2025)
  • CVE-2022-40765: Mitel MiVoice Connect Command Injection Vulnerability (added 21 Feb 2023)
  • CVE-2022-41223: Mitel MiVoice Connect Code Injection Vulnerability (added 21 Feb 2023)
  • CVE-2022-29499: Mitel MiVoice Connect Data Validation Vulnerability (added 27 Jun 2022)