CVE-2026-9089

Untrusted code execution via incomplete integrity verification

Published May 21, 2026 · Updated May 21, 2026

Improper integrity verification in ConnectWise Automate before 2026.5 allows attackers to execute untrusted agent components. During Agent plugin loading and self-update, downloaded components are processed and loaded before their authenticity and integrity are fully verified. Exploitation requires adjacent-network access under the vendor assessment and can compromise the confidentiality, integrity, and availability of the agent host.

CVSS severity8.8
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper integrity verification in ConnectWise Automate before 2026.5 allows attackers to execute untrusted agent components. During Agent plugin loading and self-update, downloaded components are processed and loaded before their authenticity and integrity are fully verified. Exploitation requires adjacent-network access under the vendor assessment and can compromise the confidentiality, integrity, and availability of the agent host.

The record

CVE
CVE-2026-9089
Published
May 21, 2026
Updated
May 21, 2026
Vendor
ConnectWise
Product
ConnectWise Automate
Classifications
CWE-494, T1129
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions prior to 2026.5

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ConnectWise · ConnectWise Automateversion=All versions prior to 2026.5

Published CVSS scores

8.8ConnectWiseCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
T1129Shared Modules

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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