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DeDeCMS CVE-2026-76800

| EUVDEUVD-2026-63194 LOW
Unrestricted Upload of File with Dangerous Type (CWE-434)
2026-08-20 VulDB GHSA-cqr6-46h6-qqxj
PHP File Upload Dedecms
2.1
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
2.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.6 HIGH

Low-privilege network upload enables PHP webshell placement, yielding high integrity impact; confidentiality limited without confirmed full RCE scope change.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Severity Changed
Aug 20, 2026 - 03:22 NVD
MEDIUM LOW
CVSS changed
Aug 20, 2026 - 03:22 NVD
5.3 (MEDIUM) 2.1 (LOW)
Analysis Generated
Aug 20, 2026 - 02:46 vuln.today
CVE Published
Aug 20, 2026 - 02:00 cve.org
MEDIUM 5.3

DescriptionCVE.org

A flaw has been found in DeDeCMS 3. Affected by this vulnerability is an unknown functionality of the file /include/dialog/select_media_post.php. Executing a manipulation of the argument uploadfile can lead to unrestricted upload. The attack can be executed remotely. The exploit has been published and may be used.

AnalysisAI

Unrestricted file upload in DeDeCMS 3 exposes the /include/dialog/select_media_post.php endpoint to abuse via the uploadfile parameter, enabling low-privileged authenticated users to upload arbitrary file types - including executable PHP scripts - to the server. Successful exploitation can culminate in remote code execution via a server-side webshell if the upload directory is web-accessible and script execution is permitted. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privilege CMS account
Delivery
Send crafted multipart POST to /include/dialog/select_media_post.php
Exploit
Upload PHP webshell via uploadfile parameter
Execution
Server stores script in web-accessible upload directory
Persist
Attacker fetches webshell URL
Impact
Execute arbitrary OS commands as web server user
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid low-privileged account on the DeDeCMS 3 instance - the CVSS 4.0 vector specifies PR:L, confirming authenticated access is a prerequisite; unauthenticated exploitation is not supported by available data. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N, E:P) confirms low-complexity network exploitation by any authenticated low-privileged user, with no special attack requirements. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker holding a low-privileged DeDeCMS account (e.g., a contributor or registered user) submits a crafted multipart HTTP POST to `/include/dialog/select_media_post.php`, uploading a PHP webshell file via the `uploadfile` parameter without triggering server-side type restrictions. The file is stored in a web-accessible upload directory, and the attacker retrieves it via its direct URL, triggering arbitrary OS command execution under the web server process. …
Remediation No vendor-released patch version is confirmed in the available data - organizations should monitor the vendor's official channels and the VulDB advisory at https://vuldb.com/vuln/393317 for patch releases. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-76800 vulnerability details – vuln.today
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