Medium severity · published Oct 22, 2026
CVE-2017-20288
QCubed 3.1.1 Reflected XSS via installer step_2.php
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QC
QCubed · QCubed
2.2.0 through 3.1.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-20288
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-20288
github.com
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/qcubed-xss.yaml
github.com
https://github.com/qcubed/qcubed/issues/1230
www.vulncheck.com
https://www.vulncheck.com/advisories/qcubed-3.1.1-reflected-xss-via-installer-step-2-php
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