How severe is CVE-2025-26842?

CVE-2025-26842 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-26842 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-26842?

CVE-2025-26842 affects Znuny. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-26842?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-26842 have an EU (EUVD) identifier?

Yes. CVE-2025-26842 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14011.

When was CVE-2025-26842 published?

CVE-2025-26842 was published on 2025-05-08 and last updated on 2026-06-17.

CVE-2025-26842

CVE-2025-26842 is a high-severity vulnerability in Znuny with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14011
Weakness: CWE-863
Affected product: Znuny
Published: 2025-05-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-26842?: 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.
How severe is CVE-2025-26842?: CVE-2025-26842 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-26842 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-26842?: CVE-2025-26842 affects Znuny. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-26842?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-26842 have an EU (EUVD) identifier?: Yes. CVE-2025-26842 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14011.
When was CVE-2025-26842 published?: CVE-2025-26842 was published on 2025-05-08 and last updated on 2026-06-17.

References

https://www.znuny.org/en/advisories/zsa-2025-01

Affected products (1)

cpe:2.3:a:znuny:znuny:*:*:*:*:-:*:*:*

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