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Upgrade to ProDetect 9router (npm) Unprotected Database Import/Export Leading to Credential Theft and Database Takeover (CVE-2026-55500) in Google Chronicle
CVE-2026-55500 affects the 9router npm package (<= 0.4.71), which exposes an unauthenticated/improperly-protected database import/export interface. Attackers can invoke this exposed functionality to exfiltrate the entire application database — including credentials, session tokens, and configuration secrets — or import a malicious database to achieve full application takeover. CVSS 9.9, CWE-200 (Exposure of Sensitive Information). A public PoC/advisory exists (GHSA-qvfm-67h2-2qfx). Detections focus on anomalous HTTP requests to database export/import endpoints, bulk data egress, unauthenticated administrative API access, and post-exploitation credential misuse.
MITRE ATT&CK
YARA-L Detection Query
rule cve_2026_55500_9router_db_export_exploit {
meta:
author = "df00tech"
description = "Detects unauthenticated access to 9router database export/import endpoints (CVE-2026-55500)"
severity = "CRITICAL"
events:
$e.metadata.event_type = "NETWORK_HTTP"
$e.target.url = /.*(export|import|backup).*/ nocase
$e.network.http.method = "GET" or $e.network.http.method = "POST"
$e.principal.user.userid = "" or $e.principal.user.userid = "-"
condition:
$e
}Detects HTTP requests to 9router database export/import/backup endpoints lacking an authenticated principal, indicating exploitation of CVE-2026-55500 in Chronicle UDM data.
Data Sources
Required Tables
False Positives & Tuning
- UDM normalization dropping user identity for legitimate authenticated traffic
- Authorized internal export automation lacking mapped principal
- Vulnerability scanners with authorized access testing similar paths
Other platforms for CVE-2026-55500
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 1Simulate Unauthenticated Database Export Request
Expected signal: Web server access log entry showing GET/POST to /api/db/export with no Authorization or session cookie header, response status 200 and non-trivial body size.
- Test 2Simulate Unauthorized Database Import
Expected signal: Web server log entry for POST to /api/db/import with multipart file upload and no auth header; application log showing database write/replace event.
- Test 3Scripted Reconnaissance of Export/Import/Backup Endpoints
Expected signal: Multiple sequential unauthenticated HTTP requests from a single source IP to distinct export/import/backup paths within a short time window, with a scripted (non-browser) User-Agent.
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