CVE-2026-26121
Published: 10 March 2026
Summary
CVE-2026-26121 is a high-severity Improper Input Validation (CWE-20) vulnerability in Microsoft Azure Iot Explorer. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 43.3th 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 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-26121 is a server-side request forgery (SSRF) vulnerability affecting Azure IoT Explorer. It stems from improper input validation (CWE-20) and SSRF (CWE-918), enabling an unauthorized attacker to perform spoofing over a network. 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 severity due to network accessibility, low attack complexity, and significant confidentiality impact with no privileges required.
An unauthorized attacker can exploit this vulnerability remotely over the network without user interaction. By inducing SSRF, the attacker can spoof network requests, potentially leading to unauthorized access to internal resources or services, as reflected in the high confidentiality impact score.
The Microsoft Security Response Center (MSRC) provides an update guide detailing mitigation and patch information for CVE-2026-26121 at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26121. Security practitioners should consult this advisory for specific remediation steps.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10690
Vulnerability details
Server-side request forgery (ssrf) in Azure IoT Explorer allows an unauthorized attacker to perform spoofing over a network.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
SSRF vulnerability with network attack vector (AV:N), no auth required, directly enables remote exploitation of a public-facing or network-accessible application for initial access.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates SSRF in Azure IoT Explorer by enforcing validation of user inputs used to construct network requests, addressing the root cause of improper input validation (CWE-20).
Provides timely flaw remediation through identification, reporting, and patching of the specific SSRF vulnerability as detailed in the MSRC update guide.
Restricts and monitors communications at system boundaries to block or alert on unauthorized outbound requests and spoofing enabled by SSRF.