What is the CVSS score of CVE-2026-2234?

CVE-2026-2234 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-2234?

Within 24 hours: Identify all C&Cm@il instances and document user count and data classification. Initiate vendor communication for patch ETA and workaround guidance. Within 7 days: Implement network segmentation to restrict C&Cm@il access to authorized internal networks only; deploy WAF rules to block unauthenticated API requests; disable external access if operationally feasible. Within 30 days: Develop and execute migration plan to alternative email solution or enforce strict access controls; conduct forensic audit for evidence of exploitation; notify affected users and regulatory bodies per breach notification requirements.

CVE-2026-2234

CRITICAL

Missing Authentication for Critical Function (CWE-306)

2026-02-09 twcert@cert.org.tw

Authentication Bypass

9.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.1 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Feb 09, 2026 - 08:16 nvd

CRITICAL 9.1

DescriptionCVE.org

C&Cm@il developed by HGiga has a Missing Authentication vulnerability, allowing unauthenticated remote attackers to read and modify any user's mail content.