Cyber Resilience

CVE-2025-26844

Znuny ≤ 7.1.3

Published
08 May 2025
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0041 34th percentile
Risk Priority 71 floored blend · peak EPSS

Summary

CVE-2025-26844 is a critical-severity Sensitive Cookie Without 'HttpOnly' Flag (CWE-1004) vulnerability in Znuny Znuny. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Steal Web Session Cookie (T1539); ranked at the 34th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-23 (Session Authenticity) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A02:2025 Security Misconfiguration

EU & UK References

Vulnerability Data

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

CWE(s)
CWE-1004

Related Threats

MITRE ATT&CK Enterprise Techniques

T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-43926Same product: Znuny Znuny
CVE-2024-48937Same product: Znuny Znuny
CVE-2024-32491Same product: Znuny Znuny
CVE-2025-26846Same product: Znuny Znuny
CVE-2024-32492Same product: Znuny Znuny
CVE-2024-32493Same product: Znuny Znuny
CVE-2025-26847Same product: Znuny Znuny
CVE-2025-26842Same product: Znuny Znuny
CVE-2025-26845Same product: Znuny Znuny
CVE-2024-48938Same product: Znuny Znuny

Affected Assets

znuny
znuny
≤ 7.1.3

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SC-23 Session Authenticity good match

Proper implementation of session authenticity requires marking sensitive session cookies HttpOnly so that client scripts cannot access them.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Broad SDLC practices catch cookie-handling defects via standards/testing (mostly forward) yet remain too general to guarantee this narrow flag setting is always enforced (partial reverse).

PR.AT-02 partial match
prevents

Role-based training can reduce the chance developers introduce missing HttpOnly flags but supplies no enforcement or detection, leaving essentially all of the implementation flaw's risk intact.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect missing HttpOnly flags but does not prevent the weakness.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate HttpOnly on sensitive cookies.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly require the HttpOnly flag for sensitive cookies.

References