CVE-2026-40321
RCE via crafted SVG upload in DNN before 10.2.2
Is CVE-2026-40321 being exploited?
Not confirmed. CVE-2026-40321 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 6.4% probability of exploitation in the next 30 days.
How severe is CVE-2026-40321?
CVE-2026-40321 is rated High with a CVSS score of 8.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-40321?
Yes. A fix has been recorded for CVE-2026-40321. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40321 affect?
CVE-2026-40321 affects DotNetNuke (DNN) < 10.2.2. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40321?
Apply 10.2.2 patch; restrict SVG uploads and validate files.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
SVG upload enables remote code execution; affects authenticated or unauthenticated users; higher risk for power users.
Patch when possible
- affected< 10.2.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.