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Vulnerability record · CVE-2026-21520 · published 22 January 2026

CVE-2026-21520: Microsoft copilot studio command injection vulnerability

Microsoft · Copilot Studio

Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector

7.5 CVSS 3.1 High EPSS 1.5% · top 27.1% CWE-77 · Command injection
7.5CVSS 3.1 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21520 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-80098Microsoft copilot studio improper verification of cryptographic signature vulnerabilityImproper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.EPSS 0.49%9.6CVE-2024-49038Microsoft copilot studio cross-site scripting vulnerabilityImproper neutralization of input during web page generation ('Cross-site Scripting') in Copilot Studio by an unauthorized attacker leads to elevation…EPSS 0.96%7.5CVE-2024-43610Microsoft copilot studio information exposure vulnerabilityExposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through …EPSS 1.1%6.5CVE-2024-38206Microsoft copilot studio server-side request forgery (ssrf) vulnerabilityAn authenticated attacker can bypass Server-Side Request Forgery (SSRF) protection in Microsoft Copilot Studio to leak sensitive information over a n…EPSS 12%9.8CVE-2026-8037Progress LoadMaster API OS Command Injection RCEProgress LoadMaster (and related ADC products) contain an OS command injection flaw in multiple API command endpoints where unsanitized input is pass…KEVEPSS 77%analysed8.7CVE-2026-42271LiteLLM MCP test endpoints allow authenticated OS command injectionLiteLLM versions 1.74.2 through before 1.83.7 expose two MCP preview endpoints (POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list) th…KEVEPSS 13%analysed7.2CVE-2025-29635D-Link DIR-823X command injection in set_prohibiting handlerD-Link DIR-823X firmware (240126 and 240802) contains a command injection flaw in the /goform/set_prohibiting POST handler. An attacker who already h…KEVEPSS 88%analysed8.1CVE-2026-22719VMware Aria Operations command injection during support-assisted migrationVMware Aria Operations contains a command injection flaw (CWE-77) that an unauthenticated attacker can use to run arbitrary commands, potentially ach…KEVEPSS 18%analysed

Source: NIST National Vulnerability Database (record CVE-2026-21520), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.