What is the CVSS score of CVE-2025-26842?

CVE-2025-26842 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.3%.

Which versions of Znuny are affected by CVE-2025-26842?

Organizations using Znuny face notable risk from CVE-2025-26842, a incorrect authorization vulnerability rated CVSS 7.5.

How to fix or mitigate CVE-2025-26842?

Within 7 days: Identify all affected systems running Znuny and apply vendor patches promptly. Monitor vendor channels for patch availability.

Znuny CVE-2025-26842

HIGH

Incorrect Authorization (CWE-863)

2025-05-08 cve@mitre.org

Authentication Bypass Znuny

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:40 vuln.today

CVE Published

May 08, 2025 - 16:15 nvd

HIGH 7.5

DescriptionCVE.org

An issue was discovered in Znuny through 7.1.3. If access to a ticket is not given, the content of S/MIME encrypted e-mail messages is visible to users with access to the CommunicationLog.

AnalysisAI

An issue was discovered in Znuny through 7.1.3. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Incorrect Authorization (CWE-863), which allows attackers to bypass authorization checks to access restricted resources. An issue was discovered in Znuny through 7.1.3. If access to a ticket is not given, the content of S/MIME encrypted e-mail messages is visible to users with access to the CommunicationLog. Affected products include: Znuny. Version information: through 7.1.3..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Review and test authorization logic, implement consistent access control checks, use centralized authorization framework.