Security Digest · Vulnerability record
CVE-2025-64095: DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem.
CVSS 10.0 Critical EPSS 47.0% · p99
Should you act?
High exploit likelihood
EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 47.0%, percentile 99: FIRST’s model estimates a 47.0% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
DNN.PLATFORM(NuGet) < 10.1.1, fixed in 10.1.1. Check your lockfile, including transitive dependencies.
What it is
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to 10.1.1, the default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files. An unauthenticated user can upload and replace existing files allowing defacing a website and combined with other issue, injection XSS payloads. This vulnerability is fixed in 10.1.1.
From the GitHub advisory
Summary The default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files.
Description An unauthenticated user can upload and replace existing files allowing defacing a website and combined with other issue, injection XSS payloads.
Weakness type: CWE-434.
Product: DNN.PLATFORM (NuGet) · Assigned by: GitHub_M · Published: 2025-10-28
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| NuGet | DNN.PLATFORM | < 10.1.1 | 10.1.1 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| dnnsoftware | Dnn.Platform | < 10.1.1 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 10 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 46.97% probability of exploitation activity in the next 30 days; percentile 99.
Timeline
- — CVE record published by GitHub_M
- — CVE record last updated
- — GitHub-reviewed advisory GHSA-3m8r-w7xg-jqvw published (critical)
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-3m8r-w7xg-jqvw github.com
- CVE.org record CVE-2025-64095 cve.org
- NVD entry CVE-2025-64095 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com