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 47.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Directly implements checks on information inputs to reject invalid data before processing.
Penetration testing attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.
Security testing and developer training directly verify and enforce proper input validation, reducing exploitability of injection and malformed-data weaknesses.
Security testing and evaluation at multiple SDLC stages directly detects missing or flawed input validation, with the required remediation process ensuring fixes are applied.
Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.
Detects server-side request forgery through monitoring of unexpected outbound connections.
Spam protection mechanisms perform filtering and detection on inbound/outbound messages, directly compensating for missing or weak input validation of unsolicited content.
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.
NVD Description
Server-side request forgery (ssrf) in Azure IoT Explorer allows an unauthorized attacker to perform spoofing over a network.
Deeper analysisAI
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.
Details
- CWE(s)