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CVE-2026-40321 is a cross-site scripting vulnerability in DNN (formerly DotNetNuke) affecting versions prior to 10.2.2. The issue allows a low-privileged user to upload a specially crafted SVG file containing script content. When the SVG is later viewed or clicked, the embedded JavaScript executes in the browser context of the visiting user and can target both authenticated and unauthenticated DNN users. The impact is significantly greater when the victim is a privileged or power user, because the script executes within that user’s authenticated session and can abuse authorized application functionality. Supporting reporting indicates the XSS can be chained with the authenticated /API/personaBar/ConfigConsole/UpdateConfigFile endpoint to write an ASPX backdoor or web shell to the server.
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No public exploit code observed for this vulnerability.
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An XSS vulnerability in DotNetNuke CMS that can be chained to achieve server compromise by uploading a malicious SVG and leveraging a privileged user's session to write a backdoor/web shell.
A critical cross-site scripting vulnerability in DotNetNuke that allows attackers to upload malicious SVG files containing JavaScript; when clicked by a privileged user, the payload executes in the victim’s authenticated session and can be chained to write an ASPX web shell to the server for full compromise.
A vulnerability in DNN (formerly DotNetNuke) prior to version 10.2.2 allows a user to upload a specially crafted SVG file containing scripts that can target authenticated and unauthenticated users.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.