CVE-2017-20288

MEDIUM 6.1

QCubed 3.1.1 Reflected XSS via installer step_2.php

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

QCubed 2.2.0 through 3.1.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the installation_path parameter. Attackers can craft GET requests to /assets/php/_devtools/installer/step_2.php with malicious installation_path values echoed unescaped, executing JavaScript in victims' browsers. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-20.

CWE	CWE-79
Vendor	qcubed
Product	qcubed
Published	Oct 22, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

QCubed / QCubed

2.2.0 ≤ 3.1.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/qcubed/qcubed/issues/1230 github.com: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/qcubed-xss.yaml vulncheck.com: https://www.vulncheck.com/advisories/qcubed-3.1.1-reflected-xss-via-installer-step-2-php

Credits

ADLab of Venustech 🔍 The Shadowserver Foundation