Detect TanStack Router Unspecified Vulnerability Exploitation in IBM QRadar
Detects potential exploitation of CVE-2026-45321, an unspecified vulnerability in TanStack Router that has been added to the CISA Known Exploited Vulnerabilities catalog. TanStack Router is a type-safe routing library for React applications. Given KEV status, active exploitation in the wild is confirmed. Detection focuses on anomalous web application behavior, suspicious client-side routing patterns, unexpected server-side request patterns, and post-exploitation indicators consistent with JavaScript framework exploitation.
MITRE ATT&CK
QRadar Detection Query
SELECT
sourceip,
destinationip,
URL,
username,
COUNT(*) AS request_count,
MIN(starttime) AS first_seen,
MAX(starttime) AS last_seen,
'CVE-2026-45321' AS cve_id
FROM events
WHERE
LOGSOURCETYPENAME(devicetype) IN ('Apache HTTP Server', 'Microsoft IIS', 'Nginx')
AND (
URL ILIKE '%__proto__%'
OR URL ILIKE '%constructor%prototype%'
OR URL ILIKE '%javascript:%'
OR URL ILIKE '%data:text%'
OR URL ILIKE '%../%'
OR URL ILIKE '%..\\%'
OR URL ILIKE '%252e252e%'
)
AND DATEFORMAT(starttime, 'yyyy-MM-dd HH:mm:ss') > DATEADD('hour', -1, NOW())
GROUP BY sourceip, destinationip, URL, username
HAVING request_count > 3
ORDER BY request_count DESC
LAST 1 HOURSQRadar AQL query detecting exploitation patterns targeting TanStack Router by identifying malformed URL requests containing prototype pollution and injection payloads from web server logs.
Data Sources
Required Tables
False Positives & Tuning
- Automated vulnerability scanners running against internal applications
- Development environments with liberal URL routing configurations
- Proxy servers that do not sanitize special characters in forwarded requests
- Legitimate application routes that use special characters in path segments
Other platforms for CVE-2026-45321
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 1TanStack Router Prototype Pollution Probe
Expected signal: Web server access logs will show GET requests to /__proto__/polluted and query parameters containing __proto__ and constructor.prototype strings. Network flow logs will show connections to port 3000.
- Test 2TanStack Router Path Traversal via Routing Parameters
Expected signal: Web access logs will record requests containing URL-encoded path traversal sequences. WAF or web server logs should show the decoded paths if URL decoding is applied before logging.
- Test 3TanStack Router JavaScript URI Injection Attempt
Expected signal: Web server logs will capture requests containing javascript: and data: URI schemes in query parameters. If the application reflects these values, browser-side CSP violation reports may also be generated.
- Test 4Post-Exploitation Lateral Movement Simulation from Compromised Node.js Process
Expected signal: EDR telemetry will show the Node.js process (or a child process) executing id, whoami, cat, find, and env commands. Process lineage will link these to the web server parent process.
Unlock Pro Content
Get the full detection package for CVE-2026-45321 including response playbook, investigation guide, and atomic red team tests.