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Upgrade to ProDetect MCP Memory Service Unauthenticated Document API Access (CVE-2026-50027) in Elastic Security
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
Elastic Detection Query
sequence by source.ip with maxspan=5m
[network where url.path : ("/api/documents", "/api/memory", "/documents") and http.request.method : ("GET","POST","PUT","DELETE") and (http.request.headers.authorization == null or http.request.headers.authorization : "")]
[network where url.path : ("/api/documents", "/api/memory", "/documents") and http.request.method : ("DELETE","PUT")]Sequences unauthenticated requests to mcp-memory-service document endpoints followed by a mutating (PUT/DELETE) call from the same source, indicating likely exploitation of the missing authentication flaw.
Data Sources
Required Tables
False Positives & Tuning
- Internal automation scripts that legitimately call the API without forwarding auth headers due to network-level trust zones
- Proxy re-writes that strip Authorization headers before events reach Elastic
- Duplicate log shipping causing repeated benign hits within the sequence window
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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