CVE-2026-2364

Local privilege escalation via setup replacement race

Published Mar 10, 2026 · Updated Mar 10, 2026

TOCTOU in CODESYS Installer before 2.6.1.0 allows local users to execute a malicious application with elevated rights. The installer verifies a downloaded setup, then leaves a race window in which a low-privileged user can replace it before the administrator-level update process executes it. Exploitation requires a low-privileged local account and a legitimate user who confirms the installer self-update prompt or starts a CODESYS Development System installation; add-on updates are unaffected.

CVSS severity7.3
High
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU in CODESYS Installer before 2.6.1.0 allows local users to execute a malicious application with elevated rights. The installer verifies a downloaded setup, then leaves a race window in which a low-privileged user can replace it before the administrator-level update process executes it. Exploitation requires a low-privileged local account and a legitimate user who confirms the installer self-update prompt or starts a CODESYS Development System installation; add-on updates are unaffected.

The record

CVE
CVE-2026-2364
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
CODESYS GmbH
Product
CODESYS Installer
Classifications
CWE-367, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=0.0.0 <2.6.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

CODESYS GmbH · CODESYS Installerversion=0.0.0 <2.6.1.0

Published CVSS scores

7.3CODESYSCVSS:3.1/AV:L/AC:L/PR:L/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1068Exploitation for Privilege Escalation

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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