CVE-2026-2590: Remote Desktop Manager Auth Bypass Issue

CVE-2026-2590 Overview

CVE-2026-2590 is an Improper Input Validation vulnerability affecting Devolutions Remote Desktop Manager. The flaw exists in the connection entry component where the "Disable password saving in vaults" setting is not properly enforced. This allows authenticated users to persist credentials in vault entries despite the security policy being configured to prevent such actions, potentially exposing sensitive information to other users with vault access.

Critical Impact

Authenticated users can bypass password saving restrictions to store credentials in vault entries, potentially exposing sensitive authentication information to other users who have access to the vault, undermining organizational security policies for credential management.

Affected Products

• Devolutions Remote Desktop Manager 2025.3.30 and earlier (Windows)
• Devolutions Remote Desktop Manager with connection entry component
• Environments with "Disable password saving in vaults" policy enabled

Discovery Timeline

• 2026-03-03 - CVE-2026-2590 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-2590

Vulnerability Analysis

This vulnerability stems from improper enforcement of administrative security controls within the Devolutions Remote Desktop Manager application. When administrators configure the "Disable password saving in vaults" setting to prevent credential storage, the application fails to properly enforce this restriction across all connection entry types.

The flaw allows authenticated users to circumvent the credential storage policy by creating or editing certain connection types while the password saving restriction is supposedly active. This represents a failure in the application's access control logic where the security setting is checked inconsistently or bypassed entirely for specific connection workflows.

The impact is significant in enterprise environments where credential management policies are critical for maintaining security boundaries between users. Credentials stored in violation of this policy become visible to other users with appropriate vault access permissions, creating potential for unauthorized access to sensitive systems.

Root Cause

The root cause is improper input validation (CWE-20) in the connection entry component. The application does not consistently validate or enforce the "Disable password saving in vaults" administrative setting when users create or modify certain connection entry types. This allows the credential persistence operation to proceed even when it should be blocked by the configured security policy.

Attack Vector

The attack vector is network-based and requires authenticated access to the Remote Desktop Manager application. An attacker with legitimate user credentials can exploit this vulnerability through the following approach:

1. The attacker authenticates to Remote Desktop Manager with valid credentials
2. The attacker creates or edits a connection entry of a type that bypasses the password saving restriction
3. The attacker enters credentials and saves the connection entry
4. Despite the "Disable password saving in vaults" setting being enabled, the credentials are persisted to the vault
5. Other users with access to the same vault can now view or use these credentials

This exploitation requires no special privileges beyond standard authenticated user access to the application. The vulnerability is particularly concerning in shared vault environments where multiple users collaborate on connection management.

Detection Methods for CVE-2026-2590

Indicators of Compromise

• Unexpected credential entries appearing in shared vaults when password saving should be disabled
• Audit log entries showing credential storage operations despite restrictive policies being in place
• Users reporting access to credentials they should not be able to see based on configured policies
• Configuration drift between intended security settings and actual application behavior

Detection Strategies

• Review Remote Desktop Manager audit logs for credential storage events that violate configured policies
• Implement periodic vault audits to identify credential entries created after password saving restrictions were enabled
• Monitor for connection entry creation or modification events that include credential persistence
• Compare configured security policies against actual credential storage behavior in production environments

Monitoring Recommendations

• Enable comprehensive audit logging within Devolutions Remote Desktop Manager
• Implement alerts for credential storage events in environments with restrictive password policies
• Regularly audit vault contents to identify policy violations
• Monitor user activity patterns for unusual connection entry creation or modification behavior

How to Mitigate CVE-2026-2590

Immediate Actions Required

• Update Devolutions Remote Desktop Manager to a version newer than 2025.3.30 that addresses this vulnerability
• Review all vault entries for credentials that may have been stored in violation of security policies
• Audit user access to shared vaults and rotate any potentially exposed credentials
• Consider temporarily restricting connection entry creation and modification privileges until patching is complete

Patch Information

Devolutions has released a security advisory addressing this vulnerability. Organizations should update to the latest version of Remote Desktop Manager that includes the fix for this improper enforcement issue. Refer to the Devolutions Security Advisory DEVO-2026-0005 for specific patch version information and update instructions.

Workarounds

• Restrict user permissions for creating and editing connection entries until the patch can be applied
• Implement additional access controls at the vault level to limit credential visibility
• Use external credential management solutions that enforce password policies independently
• Enable enhanced audit logging to detect and respond to policy violations quickly

# Example: Review Remote Desktop Manager version
# Check current installed version and compare against patched release
# Update via Devolutions package management or manual installation

# Audit vault entries for potential policy violations
# Review connection entries created after password saving restrictions were enabled
# Document and rotate any exposed credentials