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7.5 — HIGH

Critical Microsoft 365 Copilot Vulnerabilities Expose sensitive Information

📅 9 May 2026 at 02:34 UTC📰 Cyber Security NewsView original source ↗
Critical Microsoft 365 Copilot Vulnerabilities Expose sensitive Information

Microsoft has disclosed and fully remediated three critical information disclosure vulnerabilities affecting Microsoft 365 Copilot and Copilot Chat in Microsoft Edge, all released on May 7, 2026, requiring no action from end users or administrators. Microsoft’s Security Response Center published advisories for CVE-2026-26129, CVE-2026-26164, and CVE-2026-33111 as part of its ongoing commitment to transparency in […] The post Critical Microsoft 365 Copilot Vulnerabilities Expose sensitive Information appeared first on Cyber Security News.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Microsoft has disclosed and remediated three critical vulnerabilities in Microsoft 365 Copilot and Copilot Chat, exposing sensitive information over a network through improper neutralization of special elements. The vulnerabilities were identified as high-severity threats.

⚙️Technical Details
CVEs
CVE-2026-26129CVE-2026-26164CVE-2026-33111
Affected Systems
Microsoft 365 Copilot Chat
Attack Vectors
NETWORK
💥Impact Assessment
Severity: CRITICAL
Who Is at Risk
Users of Microsoft 365 Copilot and Copilot Chat
🛡️Recommended Actions
1Implement a patch for the vulnerabilities as soon as possible.
2Monitor system logs for suspicious activity related to M365 Copilot and Copilot Chat.
3Restrict access to M365 Copilot and Copilot Chat to authorized personnel only.
📦Affected Products
Microsoft 365 Copilot ChatMicrosoft Copilot Chat
🔐NVD Verified DataVERIFIED
CVE-2026-26129 ↗CVSS 7.5 — HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-138
Affected Products (CPE)
Microsoft 365 Copilot Chat
CVE-2026-26164 ↗CVSS 7.5 — HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-74
Affected Products (CPE)
Microsoft 365 Copilot Chat
CVE-2026-33111 ↗CVSS 7.5 — HIGH
Attack Vector
NETWORK
Complexity
LOW
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-77
Affected Products (CPE)
Microsoft Copilot Chat

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