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Vulnerabilities

Security incident · CVE-2025-59821

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem.

Published Sep 23, 2025 · catalog updated Sep 23, 2025 · DNNSoftware Dnn.Platform

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59821. EPSS is 0.21%. Act only if a listed version of DNNSoftware Dnn.Platform is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.21%
Remediation
Version ranges on file
Affected products
vendor DNNSoftware Dnn.Platform < 10.1.0

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, DNN’s URL/path handling and template rendering can allow specially crafted input to be reflected into a user profile that is returned to the browser. In these cases, the application does not sufficiently neutralize or encode characters that are meaningful in HTML, so an attacker can cause a victim’s browser to interpret attacker-controlled content as part of the page’s HTML. This issue has been patched in version 10.1.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor DNNSoftware Dnn.Platform < 10.1.0< 10.1.0

How to fix CVE-2025-59821

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59821. EPSS is 0.21%. Act only if a listed version of DNNSoftware Dnn.Platform is installed.

Which versions are affected?

Compare what you have installed with DNNSoftware Dnn.Platform < 10.1.0 < 10.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.21%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 23, 2025 · EUVD

    Detected

    DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, DNN’s URL/path handling and template rendering can allow specially crafted input to be reflected into a user profile that is returned to the browser. In these cases, the application does not sufficiently neutralize or encode characters that are meaningful in HTML,

  2. Sep 23, 2025 · EUVD

    Updated

    DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, DNN’s URL/path handling and template rendering can allow specially crafted input to be reflected into a user profile that is returned to the browser. In these cases, the application does not sufficiently neutralize or encode characters that are meaningful in HTML,

Sources

  • CVE.orgVulnerability recordCVE-2025-59821

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59821

    30-day exploitation probability 0.21%

    first.org
  • EUVDVulnerability recordEUVD-2025-30894

    DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, DNN’s URL/path handling and template rendering can allow specially crafted input to be reflected into a user profile that is returned to the brow

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026