Detect Kentico Xperience CMS Authentication Bypass (CVE-2025-2747) in Sumo Logic CSE
Detects exploitation of CVE-2025-2747, an authentication bypass vulnerability (CWE-288) in Kentico Xperience CMS. Attackers can access protected administrative or content management endpoints via alternate paths or channels without valid credentials, enabling unauthorized access to sensitive CMS functionality. This vulnerability is actively exploited in the wild and listed in CISA KEV.
MITRE ATT&CK
Sumo Detection Query
_sourceCategory=web/iis OR _sourceCategory=web/nginx OR _sourceCategory=web/apache
| parse "* * * * * * *" as datetime, src_ip, cs_username, method, uri_stem, status, bytes nodrop
| where uri_stem matches "/CMSPages/*" or uri_stem matches "/CMSModules/*" or uri_stem matches "/Admin/*" or uri_stem matches "/KenticoCMS/*" or uri_stem matches "*/SiteManager*" or uri_stem matches "*/CMSDesk*"
| where status in ("200","201","302")
| where cs_username = "-" or cs_username = "" or cs_username = "anonymous"
| count by src_ip, uri_stem, status
| sort by _count descDetects unauthenticated access to Kentico CMS administrative and module paths returning success responses, aggregated by source IP for triage prioritization.
Data Sources
Required Tables
False Positives & Tuning
- Public-facing Kentico content pages intentionally accessible without authentication
- Automated monitoring services performing anonymous uptime checks
- CDN edge nodes fetching content from CMS module paths without forwarding auth tokens
- Development or staging environments with authentication disabled for testing
Other platforms for CVE-2025-2747
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 1Kentico CMS Unauthenticated Admin Path Access Simulation
Expected signal: IIS access logs will record HTTP GET requests to each tested path with the source IP of the test host; requests will appear with no authenticated username (cs_username = '-').
- Test 2Alternate Channel Authentication Bypass via Parameter Manipulation
Expected signal: Web server logs capture each variant request with full URI including query string; WAF logs may flag path traversal patterns in the query string.
- Test 3Post-Bypass Webshell Upload Simulation via CMS File Manager
Expected signal: Windows Security Event Log will show file creation event (Event ID 4663) for test_detection.aspx under the CMS web root; Sysmon Event ID 11 (FileCreate) will capture the new .aspx file creation with the IIS worker process (w3wp.exe) as the creator.
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