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Honeywell IQ MultiAccess EUVDEUVD-2026-40126

| CVE-2026-13742 MEDIUM
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-06-29 Honeywell GHSA-93h9-2372-g58v
Honeywell Information Disclosure Iq Multiaccess
5.9
CVSS 4.0 · Vendor: Honeywell
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Severity by source

Vendor (Honeywell) PRIMARY
5.9 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Local vector and TOCTOU timing requirement justify AV:L and AC:H; low-privilege local account needed to write to staging path drives PR:L; high integrity and availability reflect full file-replacement impact.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H
4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (Honeywell).

CVSS VectorVendor: Honeywell

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jun 29, 2026 - 16:31 vuln.today

DescriptionCVE.org

Honeywell IQ MultiAccess, all versions prior to and including version 28, contain an improper digital signature verification vulnerability. An attacker could potentially exploit this vulnerability, leading to the replacement of downloaded file with a malicious one. Honeywell also recommends updating to the most recent version of this product, service, or offering [V27 SP1, V28 SP1]

AnalysisAI

Honeywell IQ MultiAccess physical access control software, all versions through V28, improperly verifies digital signatures on downloaded files due to a time-of-check/time-of-use (TOCTOU) race condition, allowing a local low-privileged attacker to replace a legitimately verified file with a malicious one in the window between signature check and file consumption. Successful exploitation yields high integrity and availability impact on the vulnerable system, as the replaced file may execute attacker-controlled code or corrupt system components. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Gain local low-privilege access to IQ MultiAccess host
Delivery
Identify staging directory for downloaded files
Exploit
Wait for or trigger a software download event
Install
Monitor for signature verification completion
C2
Replace staged file with malicious payload
Execute
Application consumes unsigned malicious file
Impact
Attacker-controlled code executes
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Vulnerability AssessmentAI

Exploitation Exploitation requires local system access with at least low-level privileges sufficient to write to the directory where IQ MultiAccess stages downloaded files during an update or file-download operation (PR:L per CVSS 4.0). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.9 (Medium) reflects a constrained but meaningful threat. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privileged local user on a system running unpatched IQ MultiAccess monitors the file system for a software download or update event initiated by the application. Once the target file appears in its staging path and the signature check completes, the attacker rapidly replaces it with a malicious binary before the application consumes it. …
Remediation Upgrade to V27 SP1 or V28 SP1, as confirmed by Honeywell in their product security advisory at https://www.honeywell.com/us/en/product-security. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-40126 vulnerability details – vuln.today
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