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Upgrade to ProDetect MCP Memory Service Unauthenticated Document API Access (CVE-2026-50027) in Splunk
Detects exploitation of CVE-2026-50027, a missing authentication vulnerability (CWE-306) in mcp-memory-service versions prior to 10.67.1 that allows unauthenticated attackers to read, write, and delete stored memory documents via exposed API endpoints. Successful exploitation grants full unauthenticated access to sensitive memory/document contents, enabling data exfiltration, tampering, or destruction of stored AI agent memory state.
MITRE ATT&CK
- Tactic
- Initial Access Collection Impact
SPL Detection Query
index=web_proxy OR index=app_logs sourcetype=access_combined OR sourcetype=nginx:plus:access
| regex uri_path="(?i)/(api/)?(documents|memory)"
| eval has_auth=if(isnotnull(Authorization) OR isnotnull(auth_header) OR match(_raw, "Authorization:"), 1, 0)
| where has_auth=0
| stats count as request_count, values(method) as methods, values(uri_path) as paths, values(status) as statuses by src_ip, _time span=5m
| where request_count > 5
| sort -request_countIdentifies unauthenticated requests to mcp-memory-service document/memory endpoints from web/proxy access logs, surfacing potential exploitation of CVE-2026-50027.
Data Sources
Required Sourcetypes
False Positives & Tuning
- Synthetic monitoring or uptime checks accessing public health endpoints
- Misconfigured logging that omits the Authorization header for all traffic, causing false positives across unrelated authenticated requests
- API gateway pre-authentication requests such as CORS preflight OPTIONS calls
Other platforms for CVE-2026-50027
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 GET to document API
Expected signal: HTTP GET request to /api/documents recorded in web/proxy access logs with no Authorization header present.
- Test 2Unauthenticated write to memory endpoint
Expected signal: HTTP POST request to /api/memory recorded in application logs with the injected content and no Authorization header.
- Test 3Unauthenticated delete of stored document
Expected signal: HTTP DELETE request to /api/documents/<id> recorded in access and application logs with no Authorization header, followed by removal of the document from the data store.
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