How severe is CVE-2025-26844?

CVE-2025-26844 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-26844 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-2025-26844?

CVE-2025-26844 affects Znuny. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-26844?

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

Does CVE-2025-26844 have an EU (EUVD) identifier?

Yes. CVE-2025-26844 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14012.

When was CVE-2025-26844 published?

CVE-2025-26844 was published on 2025-05-08 and last updated on 2026-06-17.

CVE-2025-26844

CVE-2025-26844 is a critical-severity vulnerability in Znuny with a CVSS 3.x base score of 9.8. 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-1004.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14012
Weakness: CWE-1004
Affected product: Znuny
Published: 2025-05-08
Last modified: 2026-06-17

Description

An issue was discovered in Znuny through 7.1.3. A cookie is set without the HttpOnly flag.

Frequently asked questions

What is CVE-2025-26844?: An issue was discovered in Znuny through 7.1.3. A cookie is set without the HttpOnly flag.
How severe is CVE-2025-26844?: CVE-2025-26844 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-26844 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-2025-26844?: CVE-2025-26844 affects Znuny. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-26844?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-26844 have an EU (EUVD) identifier?: Yes. CVE-2025-26844 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14012.
When was CVE-2025-26844 published?: CVE-2025-26844 was published on 2025-05-08 and last updated on 2026-06-17.

References

Affected products (1)

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

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CVE-2025-26847 — High (CVSS 7.5): An issue was discovered in Znuny before 7.1.5. When generating a support bundle, not all passwords are masked.
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