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Upgrade to ProDetect MCP Memory Service Unauthenticated Document API Access (CVE-2026-50027) in IBM QRadar
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
QRadar Detection Query
SELECT sourceip, destinationip, URL, "HTTP Method", COUNT(*) as requestCount
FROM events
WHERE LOGSOURCETYPENAME(devicetype) ILIKE '%HTTP%'
AND (URL ILIKE '%/api/documents%' OR URL ILIKE '%/api/memory%' OR URL ILIKE '%/documents%')
AND ("HTTP Method" IN ('GET','POST','PUT','DELETE'))
AND (UTF8(payload) NOT ILIKE '%Authorization:%')
GROUP BY sourceip, destinationip, URL, "HTTP Method"
HAVING COUNT(*) > 5
LAST 24 HOURSFlags QRadar-normalized HTTP events showing repeated unauthenticated calls to mcp-memory-service document/memory endpoints, consistent with CVE-2026-50027 exploitation.
Data Sources
Required Tables
False Positives & Tuning
- Payload inspection missing Authorization header due to TLS termination occurring before QRadar log collection
- Legitimate internal scanners or asset discovery tools probing the endpoint
- Load-balanced health check traffic hitting the same URL paths repeatedly
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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