What’s Vulnerable › Vulnerabilities

CVE-2025-32371: Unexpected external content may be displayed in DNN ImageHandler

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-09 · updated 2026-06-17
• Weakness: CWE-451

Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. A url could be crafted to the DNN ImageHandler to render text from a querystring parameter. This text would display in the resulting image and a user that trusts the domain might think that the information is legitimate. This vulnerability is fixed in 9.13.4.

Affected products

• DotNetNuke CMS Fixed in 9.1.1: before 9.13.4 — fixed in 9.13.4

How to fix

Upgrade to a fixed version: DotNetNuke CMS Fixed in 9.1.1 9.13.4. Check the vendor advisory for mitigations.

References

• https://github.com/dnnsoftware/Dnn.Platform/commit/5def7cc2e7931bb1041b21540bde99f96874a5a9
• https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-2rrc-g594-rhqw

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