Detect CVE-2025-2746: Kentico Xperience CMS Authentication Bypass in Sumo Logic CSE
Detects exploitation of CVE-2025-2746, an authentication bypass vulnerability (CWE-288) in Kentico Xperience CMS that allows attackers to access protected resources via alternate paths or channels without valid credentials. This vulnerability is actively exploited in the wild (CISA KEV).
MITRE ATT&CK
Sumo Detection Query
_sourceCategory=iis OR _sourceCategory=webserver
| parse regex "(?P<src_ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) .* (?P<method>GET|POST|PUT|DELETE|PATCH) (?P<uri>/[^ ]*) .* (?P<status>\d{3}) .* (?P<username>[^ ]+)"
| where uri matches "/CMSPages/*" OR uri matches "/CMSModules/*" OR uri matches "/CMSAdminControls/*" OR uri matches "/CMS/*" OR uri matches "/Admin/*"
| where status in ("200", "201", "302")
| where username in ("-", "", "anonymous") OR isNull(username)
| where !(uri matches "*login*" OR uri matches "*logon*" OR uri matches "*signin*")
| timeslice 5m
| stats count as request_count, dcount(uri) as distinct_uris, values(uri) as uri_list by src_ip, _timeslice
| where request_count >= 3
| sort by request_count desc
| fields src_ip, _timeslice, request_count, distinct_uris, uri_listSumo Logic query detecting unauthenticated access to Kentico Xperience CMS protected paths returning HTTP success codes. Aggregates by source IP in 5-minute windows to surface exploitation patterns for CVE-2025-2746.
Data Sources
Required Tables
False Positives & Tuning
- Web crawlers or SEO tools indexing CMS content that overlaps with protected path naming conventions
- Internal integration services using non-standard authentication methods not reflected in IIS username field
- Development or staging environments where authentication is intentionally disabled for testing
- Legitimate users whose session cookies were stripped by a proxy or WAF misconfiguration
Other platforms for CVE-2025-2746
Testing Methodology
Validate this detection against 4 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 1CVE-2025-2746 Authentication Bypass Path Enumeration
Expected signal: IIS access log entries showing HTTP GET requests to /CMSPages/, /CMSModules/, /CMSAdminControls/, /CMS/, and /Admin/ paths from the test host IP without a cs-username value, with HTTP response codes of 200, 302, or 401 depending on patch status.
- Test 2CVE-2025-2746 Alternate Path Channel Bypass Attempt
Expected signal: IIS logs should capture the URL-encoded and case-variant path requests. ASP.NET request normalization may cause the logged URI to differ from the requested URI — look for both raw and normalized forms in telemetry. Windows Security Event Log may show failed authorization attempts (Event ID 4625) if integrated auth is configured.
- Test 3CVE-2025-2746 Post-Exploitation CMS Account Creation Simulation
Expected signal: IIS logs showing POST request to /CMSModules/Membership/Pages/Users/User_Edit_General.aspx without authentication. Kentico CMS_EventLog table entries for user creation attempt. Windows Security Event Log entries for IIS process activity. If successful on unpatched system, CMS_User table will contain the new account.
- Test 4CVE-2025-2746 Network-Level Authentication Bypass Detection Validation
Expected signal: 10 concurrent HTTP requests to Kentico CMS paths appearing in IIS logs within a 1-second window, all from the same source IP without authentication headers. The burst pattern should appear clearly in SIEM dashboards.
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