EUVD-2026-43260
GHSA-q9gx-wp22-jh5r
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Admin authentication required (PR:H) but RCE via PHP webshell execution causes full scope change with high C/I/A impact on the underlying server.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Lifecycle Timeline
3DescriptionCVE.org
A vulnerability has been found in AREA 17 Twill CMS up to 3.6.0. The impacted element is the function FileLibraryController::storeFile of the file src/Http/Controllers/Admin/FileLibraryController.php of the component Media Library Insert Page. Such manipulation of the argument qqfilename leads to unrestricted upload. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Unrestricted file upload in AREA 17 Twill CMS (versions up to 3.6.0) allows authenticated admin users to upload arbitrary file types via the qqfilename parameter in the Media Library Insert Page, creating a direct path to remote code execution on the underlying server. A public proof-of-concept documenting the full exploitation chain from file upload to RCE has been published by Bytium. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid Twill CMS administrator-level account, as reflected by PR:H in the CVSS 4.0 vector - the vulnerable `storeFile` endpoint is only reachable through the authenticated admin panel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N, score 5.1) materially understates real-world impact relative to what the Bytium POC demonstrates - full remote code execution, which implies VC:H/VI:H/VA:H at minimum and likely high subsequent-system impact as well. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained Twill CMS admin credentials - via phishing, credential stuffing against a reused password, or insider access - logs into the admin panel, navigates to the Media Library Insert Page, and submits a file upload request with the `qqfilename` parameter set to a `.php` filename containing a webshell payload. The server stores the file in the web-accessible uploads directory without extension validation, and the attacker then issues an HTTP GET request directly to the uploaded file's URL, causing the PHP runtime to execute the shell and return full server-level command output. … |
| Remediation | No vendor-released patch has been identified at time of analysis - the vendor did not respond to responsible disclosure, and no fix version can be cited. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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