CVE-2026-28254
Published: 12 March 2026
Summary
CVE-2026-28254 is a medium-severity Missing Authorization (CWE-862) vulnerability in Trane Tracer Sc Firmware. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 13.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-14 (Permitted Actions Without Identification or Authentication) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-28254 is a Missing Authorization vulnerability (CWE-862) affecting Trane Tracer SC, Tracer SC+, and Tracer Concierge systems. Published on 2026-03-12, it stems from unprotected APIs that fail to enforce proper authentication checks, enabling unauthorized access to sensitive information. The vulnerability carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating high confidentiality impact with no effects on integrity or availability.
An unauthenticated attacker with network access to the affected systems can exploit this issue with low attack complexity and no user interaction required. Exploitation allows the attacker to retrieve sensitive data exposed through the vulnerable APIs, potentially leading to information disclosure without requiring privileges or special conditions.
The CISA advisory ICSA-26-071-01 provides details on mitigation strategies for this vulnerability; security practitioners should consult https://www.cisa.gov/news-events/ics-advisories/icsa-26-071-01 for recommended patches and remediation steps.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-11633
Vulnerability details
A Missing Authorization vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an unauthenticated attacker to access sensitive information through unprotected APIs.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Missing authorization on network-accessible APIs directly enables remote exploitation of a public-facing (or network-exposed) application for initial unauthenticated access and information disclosure.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires enforcement of approved authorizations on unprotected APIs to prevent unauthenticated access to sensitive information.
Explicitly defines and restricts actions permissible without identification or authentication, mitigating exposure of sensitive APIs to unauthenticated attackers.
Monitors the system specifically for unauthorized disclosures of information through vulnerable APIs, enabling timely detection of exploitation.