---
id: CVE-2026-78417
title: >-
  Insufficient verification of data authenticity in the IronVNC client in
  Devolutions Remote Desktop Manager 2026.2.17.0 and earlier, 2026.1.24.0 and
  earlier, allows an on-path attacker to intercept and tamper with VNC sessions
  via automat…
summary: >-
  Insufficient verification of data authenticity in the IronVNC client in
  Devolutions Remote Desktop Manager 2026.2.17.0 and earlier, 2026.1.24.0 and
  earlier, allows an on-path attacker to intercept and tamper with VNC sessions
  via automat…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-345
published: '2026-08-24'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T15:10:00.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78417'
references:
  - url: 'https://devolutions.net/security/advisories/DEVO-2026-0029/'
    label: security@devolutions.net
tags:
  - nvd
epss: 0.00154
epssPercentile: 0.03957
ingestedAt: '2026-10-12T15:55:08.130Z'
---

## Overview

Insufficient verification of data authenticity in the IronVNC client in Devolutions Remote Desktop Manager 2026.2.17.0 and earlier, 2026.1.24.0 and earlier, allows an on-path attacker to intercept and tamper with VNC sessions via automatic acceptance of the server's RSA key during RSA-AES authentication.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.