{"id":"CVE-2017-20288","kind":"vulnerability","aliases":["CVE-2017-20288"],"related":[],"title":"QCubed PHP framework: reflected XSS via installer step_2 parameter","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.","summary":"QCubed 2.2.0 through 3.1.1 echoes the installation_path parameter unescaped on its installer page /assets/php/_devtools/installer/step_2.php. An attacker who lures a victim to a crafted GET link can run JavaScript in the victim's browser.","severity":"medium","cvss":6.1,"epss":0.00256,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","php","qcubed","self-hosted"],"not_affected_if":["default-config","not-qcubed"],"how_to_check":"- Look for the file `assets/php/_devtools/installer/step_2.php` in the QCubed install tree\n- Check the installed QCubed version against the affected range 2.2.0 through 3.1.1\n- Review web server access logs for GET requests to `/assets/php/_devtools/installer/step_2.php` with `installation_path` values containing script or HTML","fix":"- Upgrade QCubed to a version later than `3.1.1`, or remove the `_devtools/installer` directory from production\n- unknown whether a specific fixed version is named in the sources","status":"open","published_at":"2026-10-22T11:17:02+00:00","first_seen_at":"2026-10-23T21:57:30+00:00","triaged_at":"2026-10-25T04:03:22+00:00","updated_at":"2026-10-25T04:03:22+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-10-25T04:03:22Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade QCubed to a version later than `3.1.1`, or remove the `_devtools/installer` directory from production\n- unknown whether a specific fixed version is named in the sources","reach":"internet","title":"QCubed PHP framework: reflected XSS via installer step_2 parameter","impact":"medium","summary":"QCubed 2.2.0 through 3.1.1 echoes the installation_path parameter unescaped on its installer page /assets/php/_devtools/installer/step_2.php. An attacker who lures a victim to a crafted GET link can run JavaScript in the victim's browser.","category":"package","nicknames":[],"who_cares":["php","qcubed","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker script runs in victim browsers on the affected site.","analyst_note":"Confirm the fixed QCubed version and whether the _devtools installer ships enabled in release builds; check the NVD page for the CVSS vector.","how_to_check":"- Look for the file `assets/php/_devtools/installer/step_2.php` in the QCubed install tree\n- Check the installed QCubed version against the affected range 2.2.0 through 3.1.1\n- Review web server access logs for GET requests to `/assets/php/_devtools/installer/step_2.php` with `installation_path` values containing script or HTML","needs_analyst":true,"not_affected_if":["default-config","not-qcubed"],"who_is_affected":"Sites that run QCubed between 2.2.0 and 3.1.1 with the development installer directory reachable over the web. Deployments that block or remove the `_devtools` directory, or that are not running QCubed, can skip it. The sources do not say whether the installer is exposed by default.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000663,"input_tokens":3428,"output_tokens":640,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-10':111C '-20':112C '-2017':12A,15A '-20288':13A,16A '/assets/php/_devtools/installer/step_2.php':37B,87C '2':9A '2.2.0':24B,58C '2023':110C '3.1.1':26B,60C 'allow':70C 'attack':39B,72C,81C 'browser':56B,99C 'contain':61C 'craft':46B,83C 'cross':65C 'cross-sit':64C 'cve':11A,14A 'echo':27B,93C 'evid':101C 'execut':95C 'exploit':100C 'first':103C 'foundat':108C 'framework':3A 'get':47B,84C 'host':22B 'inject':74C 'instal':7A,29B,35B,78C,90C 'javascript':51B,96C 'link':48B 'lure':41B 'malici':89C 'observ':104C 'packag':17B 'page':36B 'paramet':10A,31B,80C 'path':30B,79C,91C 'php':2A,18B 'qcube':1A,19B,23B,57C 'reflect':4A,63C 'request':85C 'run':50B 'script':67C,75C 'self':21B 'self-host':20B 'shadowserv':107C 'site':66C 'step':8A 'unauthent':71C 'unescap':32B,94C 'valu':92C 'via':6A 'victim':43B,54B,98C 'vulner':68C 'xss':5A","nicknames":[],"mitigations":[],"who_affected":"Sites that run QCubed between 2.2.0 and 3.1.1 with the development installer directory reachable over the web. Deployments that block or remove the `_devtools` directory, or that are not running QCubed, can skip it. The sources do not say whether the installer is exposed by default.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-22T11:17:02+00:00","kev":null,"cvss_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/E:X/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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2017-20288","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-20288","severity":null,"published_at":"2026-10-22T11:17:02+00:00","modified_at":"2026-10-22T17:40:46+00:00","first_seen_at":"2026-10-23T21:57:30+00:00","fetched_at":"2026-10-23T22:29:02+00:00","note":null},{"source":"epss","external_id":"CVE-2017-20288","url":"https://api.first.org/data/v1/epss?cve=CVE-2017-20288","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-24T07:15:51+00:00","fetched_at":"2026-10-24T07:15:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}