Detect CVE-2026-48908 - JoomShaper SP Page Builder Unrestricted File Upload in Sumo Logic CSE
Detects exploitation of CVE-2026-48908, an unrestricted file upload vulnerability (CWE-434) in JoomShaper SP Page Builder for Joomla. Attackers can upload files with dangerous types (e.g., PHP webshells) through the page builder interface, leading to remote code execution. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
MITRE ATT&CK
- Tactic
- Initial Access Execution Persistence
Sumo Detection Query
_sourceCategory=web/access OR _sourceCategory=iis OR _sourceCategory=proxy
| parse regex "(?P<src_ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}).*POST.*(?P<uri>/[^\s]*/components/com_sppagebuilder[^\s]*).*(?P<status>2\d{2})"
| where status in ("200", "201", "202")
| parse regex field=uri "(?P<dangerous_ext>\.(php\d?|phtml|phar|asp|aspx|jsp|cgi|pl|py|sh|bash))" nodrop
| if (isEmpty(dangerous_ext), "none", dangerous_ext) as file_extension
| parse "*filename=*" as _x, filename nodrop
| parse regex field=filename "(?P<fname_ext>\.(php\d?|phtml|phar|asp|aspx|jsp))$" nodrop
| where !isEmpty(dangerous_ext) or !isEmpty(fname_ext)
| eval cve = "CVE-2026-48908"
| eval risk = 90
| count as upload_count by src_ip, uri, file_extension, fname_ext, status, cve, risk
| sort by upload_count descSumo Logic query detecting SP Page Builder upload requests with dangerous file extensions consistent with CVE-2026-48908 exploitation attempts.
Data Sources
False Positives & Tuning
- Joomla extension auto-updates that temporarily write PHP files to component directories
- Content migration scripts that move legitimate PHP template files
- Security assessment tools generating test requests to the upload endpoint
Other platforms for CVE-2026-48908
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Unauthenticated PHP Webshell Upload via SP Page Builder
Expected signal: Web server access log entry: POST /index.php?option=com_sppagebuilder&task=file.upload HTTP/1.1 200; multipart/form-data body containing filename=shell.php with PHP content
- Test 2Double Extension Bypass Upload Attempt
Expected signal: POST request to SP Page Builder upload endpoint with filename containing double extension (.php.jpg); web server logs showing 200 response and file write event to upload directory
- Test 3Webshell Execution Verification Post-Upload
Expected signal: Web server access log entries: GET /images/shell.php HTTP/1.1 200; process execution events showing php-fpm or apache spawning child processes (id, hostname, uname); potential outbound network connections from web server process
References (4)
- https://extensions.joomla.org/extension/sp-page-builder/
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-48908
Unlock Pro Content
Get the full detection package for CVE-2026-48908 including response playbook, investigation guide, and atomic red team tests.