CVE-2025-62802VulnerabilityPublished 28 Oct 2025

CVE-2025-62802: dnnsoftware Dnn.Platform · Insecure Default Initialization of Resource

Affects dnnsoftware Dnn.PlatformSource CVE Database V5

Not known to be exploited · CVSS 4.3 Medium : upgrade to 10.1.1 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 10.1.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade dnnsoftware Dnn.Platform to 10.1.1.

Affected software

Product	Affected	Fixed in
NuGetdnn.platform`pkg:nuget/dnn.platform`Other threats	Affected <10.1.1	Fixed in 10.1.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately upgrade all Dnn.Platform instances to version 10.1.1 or later to remediate this vulnerability. Until upgrades can be applied, administrators should disable or restrict the HTML editor's file upload functionality for unauthenticated users through configuration changes or access controls. Implement web application firewalls (WAFs) with rules to detect and block unauthorized file upload attempts targeting Dnn.Platform endpoints. Conduct thorough audits of existing uploaded files to identify and remove any unauthorized or suspicious content. Additionally, enforce strict input validation and file type restrictions on uploads, and monitor logs for unusual upload activity. Regularly review user permissions and ensure that only authenticated and authorized users have file upload capabilities. Finally, maintain an incident response plan to quickly address any exploitation attempts.

Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to 10.1.1, the out-of-box experience for HTML editing allows unauthenticated users to upload files. This opens a potential vector to other security issues and is not needed on most implementations. This vulnerability is fixed in 10.1.1.

Impact

For European organizations, this vulnerability poses a moderate risk primarily to web integrity and security posture. Organizations running vulnerable versions of Dnn.Platform may face unauthorized file uploads that could lead to website defacement, injection of malicious scripts, or establishment of backdoors. This can result in reputational damage, regulatory scrutiny under GDPR if personal data is compromised, and potential lateral movement within internal networks. The impact is more pronounced for public-facing websites or portals that rely on Dnn.Platform for content management. Since the vulnerability does not directly affect confidentiality or availability, the immediate operational disruption may be limited, but the indirect consequences of a successful attack could be severe. Organizations in sectors with high web presence, such as government, education, and media, are particularly at risk.

Summary

CVE-2025-62802 is a vulnerability identified in the Dnn.Platform, an open-source web content management system widely used in the Microsoft ecosystem. The root cause is an insecure default initialization of the HTML editor component prior to version 10.1.1, which permits unauthenticated users to upload files. This behavior violates secure default principles and introduces a significant attack surface. The vulnerability is classified under CWE-1188 (Insecure Default Initialization of Resource) and CWE-434 (Unrestricted Upload of File with Dangerous Type). Although the vulnerability itself does not directly disclose sensitive information or cause denial of service, it enables attackers to upload potentially malicious files, such as web shells or scripts, which can be leveraged for further attacks including privilege escalation, data tampering, or persistent access. The CVSS v3.1 score is 4.3 (medium), reflecting the network attack vector, no privileges required, but requiring user interaction (e.g., triggering the upload functionality). No known exploits are currently reported in the wild, but the risk remains significant due to the ease of exploitation and the common use of Dnn.Platform in enterprise web environments. The vulnerability is resolved in version 10.1.1 by disabling or securing the default file upload functionality for unauthenticated users.

CWE-1188Initialization of a Resource with an Insecure Default (opens in a new tab)
Base weakness
The product initializes or sets a resource with a default that is intended to be changed by the product's installer, administrator, or maintainer, but the default is not secure.
OWASP Cheat Sheets
Forgot Password (opens in a new tab)
OWASP ASVS 4.0.3
V2.3.1 (opens in a new tab)
V2.6.2 (opens in a new tab)
V2.7.6 (opens in a new tab)
Attack patterns
Exploitation of Thunderbolt Protection Flaws (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-434Unrestricted Upload of File with Dangerous Type (opens in a new tab)
Base weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #12OWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
Architecture and Design
Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
Architecture and Design · Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
Architecture and Design
Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Web Service Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
File Upload (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V12.5.2 (opens in a new tab)
V13.1.5 (opens in a new tab)
V12.2.1 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-2374-6cvw-qmx6 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Nov 2025, 02:13 UTC

WeaknessesCWE-1188, CWE-434

Technical details

References

Community reviews

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