CVE-2023-33404Blogengine.net Unrestricted File Upload
An Unrestricted Upload vulnerability, due to insufficient validation on UploadControlled.cs file, in BlogEngine.Net version 3.3.8.0 and earlier allows remote attackers to execute remote code.
Published Jun 26, 2023 · Updated Aug 27, 2026
Key Facts
Patch immediately- CVE-2023-33404 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Blogengine.net.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 26% probability of exploitation in the next 30 days.
- Fixed versions are available, including Blogengine.net <=3.3.8.0, Blogengine.net 3.3.8.0.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
26%
Higher than 97.9% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
40/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
An Unrestricted Upload vulnerability, due to insufficient validation on UploadControlled.cs file, in BlogEngine.Net version 3.3.8.0 and earlier allows remote attackers to execute remote code.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Blogengine.netBlogengine | See advisory | 3.3.8.0 |
Patched Releases
Blogengine.net
<=3.3.8.0
Timeline
Publicly disclosed
Jun 26, 2023
Last updated
Aug 27, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisorycve.org · CVERecord
- advisorynvd.nist.gov · CVE-2023-33404
- exploitgithub.com · CVE-2023-33404
FAQ
Common Questions.
An Unrestricted Upload vulnerability, due to insufficient validation on UploadControlled.cs file, in BlogEngine.Net version 3.3.8.0 and earlier allows remote attackers to execute remote code.
Affected: Blogengine.net. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Blogengine.net <=3.3.8.0, Blogengine.net 3.3.8.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2023-33404 On Your Attack Surface?
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