CVE-2026-21520CWE-77

Copilot Studio Information Disclosure Vulnerability

High · published January 22, 2026

CVSS v3.1
7.5
EPSS
2%
Percentile
74.6
In the wild
Unconfirmed
What it is

⚡ An unauthenticated attacker can peek into sensitive information within Copilot Studio, making it surprisingly easy to gain access to confidential data! Think of it like a restaurant where the kitchen is completely open to the public—anyone can just stroll in and see the secret recipes being prepared without a single check at the door! This vulnerability could lead to unauthorized access to sensitive information, potentially allowing attackers to gather critical details that could be exploited in future attacks. Imagine if a competitor could see your special sauce recipe—yikes!

Put simply

Think of it like a restaurant where the kitchen is completely open to the public—anyone can just stroll in and see the secret recipes being prepared without a single check at the door! This vulnerability arises from insufficient access controls in Copilot Studio, allowing unauthenticated users to view sensitive information through a network attack vector.

What to do

This vulnerability could lead to unauthorized access to sensitive information, potentially allowing attackers to gather critical details that could be exploited in future attacks. Imagine if a competitor could see your special sauce recipe—yikes! To mitigate this risk, ensure that strict authentication measures are implemented for accessing sensitive data and regularly audit access logs for any suspicious activity. Additionally, patch Copilot Studio to the latest version as soon as it's available to safeguard against this exposure. You've got this! Follow these steps to secure your information and become a security hero! 🛡️

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C/CR:H/IR:L/AR:L
CVSS v4.0
Not supplied
EPSS
0.01534 · 74.6th percentile
Weakness
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection')
Published
2026-01-22T22:47Z
EPSS history
Timeline
  • 22 JAN 22:47Z
    Copilot Studio Information Disclosure Vulnerability
    cvelistv5