CVE-2026-13742

Local code execution via post-verification file replacement

Published Jun 29, 2026 · Updated Jun 29, 2026

Improper signature verification in Honeywell IQ MultiAccess 28 and earlier allows local users to execute untrusted code via file replacement. The download path verifies a file only when received, then executes it without revalidating integrity or authenticity, leaving a TOCTOU window for replacement. Exploitation requires local product access and winning that timing window; successful replacement runs attacker-controlled code in the vulnerable process.

CVSS severity5.9
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Honeywell IQ MultiAccess 28 and earlier allows local users to execute untrusted code via file replacement. The download path verifies a file only when received, then executes it without revalidating integrity or authenticity, leaving a TOCTOU window for replacement. Exploitation requires local product access and winning that timing window; successful replacement runs attacker-controlled code in the vulnerable process.

The record

CVE
CVE-2026-13742
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Honeywell Technologies
Product
IQ MultiAccess
Classifications
CWE-367, CAPEC-29, CAPEC-27
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 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=IQ.v27 <=28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Honeywell Technologies · IQ MultiAccessversion=IQ.v27 <=28

Published CVSS scores

5.9Honeywell International Inc.CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
CAPEC-29Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
CAPEC-27Leveraging Race Conditions via Symbolic Links

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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