CVE-2025-14265
CriticalSummary
In ScreenConnect versions prior to 25.8, server-side validation and integrity checks within the extension subsystem could allow the installation and execution of untrusted or arbitrary extensions by authorized or administrative users. Abuse of this behavior could result in the execution of custom code on the server or unauthorized access to application configuration data. This issue affects only the ScreenConnect server component; host and guest clients are not impacted.
Risk Assessment
The risk includes server takeover by a privileged user, potentially leading to confidentiality breaches of configuration data and system integrity.
Recommendation
Immediately upgrade ScreenConnect to version 25.8 or later, which introduces enhanced server-side configuration handling and integrity checks.
Other vulnerabilities in ScreenConnect
See all- CVE-2026-3564Critical
A vulnerability in the ScreenConnect server component allows an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios. ScreenConnect host and guest client agents are not independently affected by this CVE.
- CVE-2025-3935HighActively exploited
ScreenConnect versions 25.2.3 and earlier may be susceptible to a ViewState code injection attack. To obtain the necessary machine keys, privileged system level access must be obtained.
- CVE-2026-11596Medium
In ScreenConnect™ versions prior to 26.2, input validation within the Host Pass creation functionality could allow an authenticated user with Host Pass creation privileges to specify a token expiration duration beyond the intended maximum when generating delegated access tokens.
Original NVD description (English source)
In versions of ScreenConnect™ prior to 25.8, server-side validation and integrity checks within the extension subsystem could allow the installation and execution of untrusted or arbitrary extensions by authorized or administrative users. Abuse of this behavior could result in the execution of custom code on the server or unauthorized access to application configuration data. This issue affects only the ScreenConnect server component; host and guest clients are not impacted. ScreenConnect 25.8 introduces enhanced server-side configuration handling and integrity checks to ensure only trusted extensions can be installed.