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Security Bypass Vulnerability in ScreenConnect

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

ScreenConnect versions prior to 26.1

Overview

A vulnerability has been reported in ScreenConnect, which could allow a remote attacker to gain elevated access or bypass security restrictions on the targeted system.

Target Audience:

All end-user organizations and individuals using affected ScreenConnect versions.

Risk Assessment:

High risk of unauthorized access to data.

Impact Assessment:

Potential for unauthorized session access and exposure of sensitive data.

Description

ScreenConnect is a remote access and support software that enables users to connect to and manage devices remotely.

This vulnerability exists in ScreenConnect due to improper verification of cryptographic signature . In affected versions, server-level cryptographic material (machine keys) stored in configuration files could be exposed under certain conditions. An attacker who obtains this material may misuse it for session authentication.

Successful exploitation of this vulnerability could allow a remote attacker to bypass authentication controls, gain unauthorized access to active sessions, or escalate privileges on the targeted system.

Solution

Apply appropriate updates as mentioned in:

https://www.connectwise.com/company/trust/security-bulletins/2026-03-17-screenconnect-bulletin

Vendor Information

Connectwise

https://www.connectwise.com/company/trust/security-bulletins/2026-03-17-screenconnect-bulletin

References

Connectwise

https://www.connectwise.com/company/trust/security-bulletins/2026-03-17-screenconnect-bulletin

CVE Name

CVE-2026-3564

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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