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CVE-2025-14265

Improper server-side validation in ScreenConnect extension framework

Products / packages ConnectWise ScreenConnect

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:25:34 UTC
ConnectWise · CVSS:3.1 · 9.1
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Severity

critical9.1

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

ScreenConnect versions prior to 25.8 have an improper server-side validation issue, allowing authorized users to install untrusted extensions, potentially leading to custom code execution or unauthorized access to configuration data. The issue affects only the ScreenConnect server component. Abuse of this behavior could result in security issues.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

ConnectWise · ConnectWise

ScreenConnect

1 range
ConnectWise version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

All versions prior to 2025.8

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Cloud: No action is required. ScreenConnect servers hosted in “screenconnect.com” cloud (standalone and Automate/RMM integrated) or “hostedrmm.com” for Automate partners have been updated to remediate the issue.   

On-prem:

  • ScreenConnect Partners: Please upgrade to ScreenConnect version 25.8 and update your guest clients to the same version. Visit Download | ScreenConnect page to download and apply the update (access requires a valid on-premises license). 
  • Automate On-Prem Partners with ScreenConnect Integration: 

Partners using an on-premises ScreenConnect installation integrated with Automate must ensure that the Automate ScreenConnect Extension is updated to version 4.4.0.16 before upgrading the ScreenConnect server to version 25.8. Once confirmed, visit the

Automate Product Updates https://docs.connectwise.com/ConnectWise_Automate_Documentation/Automate_Product_Updates

page to download and apply the ScreenConnect 25.8 update.

ConnectWise guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

1 sources
www.connectwise.com/company/trust/security-bulletins/screenconnect-2025.8-security-patch
Security advisoryConnectWise

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2025-14265

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-494 ↗

CWE-494 Download of Code Without Integrity Check

ConnectWise

Related →
Contributing organizations · 2
ConnectWise

Assigning organization

2025-12-11
CISA-ADP

Additional data publisher

2026-11-03

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

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Large field values are marked as truncated previews. Original source snapshots remain retained.