CVE-2026-24837

High

Published: 28 January 2026

Published

28 January 2026

Modified

04 February 2026

KEV Added

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Patch

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CVSS Score v3.1 7.6 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

EPSS Score 0.0002 4.2th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-24837 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Dnnsoftware Dotnetnuke. Its CVSS base score is 7.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Browser Session Hijacking (T1185); ranked at the 4.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Deeper analysis

CVE-2026-24837 is a cross-site scripting (XSS) vulnerability (CWE-79) in DNN Platform, an open-source web content management system (CMS) formerly known as DotNetNuke and part of the Microsoft ecosystem. The issue affects versions starting from 9.0.0 up to but not including 9.13.10 and 10.2.0, where a module's friendly name can embed scripts that execute during certain module operations within the Persona Bar administrative interface. The vulnerability has a CVSS v3.1 base score of 7.6 (AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H), indicating high impact potential despite elevated requirements for exploitation.

Exploitation requires an attacker to have high privileges (PR:H) on the target DNN instance, combined with high attack complexity (AC:H) and user interaction (UI:R). A malicious actor with such access could craft a module friendly name containing scripts, tricking a privileged administrator into performing a module operation in the Persona Bar that triggers execution. Successful exploitation allows scope change (S:C) with high impacts on confidentiality, integrity, and availability (C:I:A:H), potentially enabling data theft, site defacement, or arbitrary code execution in the context of the administrative session.

The official GitHub security advisory for DNN Platform (GHSA-vm5q-8qww-h238) confirms that versions 9.13.10 and 10.2.0 address the vulnerability through targeted fixes. Security practitioners should prioritize upgrading affected DNN installations to these patched versions and review module configurations for any untrusted friendly names.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-4864

Vulnerability details

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Starting in version 9.0.0 and prior to versions 9.13.10 and 10.2.0, a module friendly name could include scripts that will run during some module operations…

in the Persona Bar. Versions 9.13.10 and 10.2.0 contain a fix for the issue.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

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 →

T1491.002 External Defacement Impact

An adversary may deface systems external to an organization in an attempt to deliver messaging, intimidate, or otherwise mislead an organization or users.

attack.mitre.org →

Why these techniques?

Stored XSS in authenticated admin interface directly enables browser session hijacking and web session cookie theft via injected scripts; also facilitates external defacement as explicitly noted in impact description.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1