CVE-2026-13742 Honeywell Technologies CVE debrief

Who should care

Defenders responsible for Honeywell IQ MultiAccess systems should assess exposure and prioritize updates to address the vulnerability. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and verify the integrity of downloaded files, implement additional security controls, and monitor for potential exploitation attempts.

Why it matters

Defenders should care about CVE-2026-13742 because it affects Honeywell IQ MultiAccess systems, potentially allowing malicious file replacement. Updates to V27 SP1 or V28 SP1 are recommended.

• Potential replacement of downloaded files with malicious ones
• Need to verify integrity of downloaded files
• Potential impact on system security and data integrity
• Requires updates to ensure secure file downloads

Technical summary

The Honeywell IQ MultiAccess system, all versions prior to and including version 28, is vulnerable to an improper digital signature verification issue. This vulnerability could allow an attacker to replace a downloaded file with a malicious one. The vulnerability affects Honeywell IQ MultiAccess systems, and defenders should prioritize updating to the most recent version, specifically V27 SP1 or V28 SP1, to address the improper digital signature verification vulnerability. The CVE record and NVD entry provide details on the vulnerability.

Defensive priority

Defenders should prioritize updating to the most recent version of Honeywell IQ MultiAccess, specifically V27 SP1 or V28 SP1, to address the improper digital signature verification vulnerability.

Recommended defensive actions

• Update to the most recent version of Honeywell IQ MultiAccess, specifically V27 SP1 or V28 SP1
• Review and verify the integrity of downloaded files
• Implement additional security controls to monitor and detect potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the improper digital signature verification vulnerability in Honeywell IQ MultiAccess. However, the scope of affected versions and systems requires further verification.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.