Microsoft M365 Copilot information disclosure

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.8$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Microsoft M365 Copilot. This affects an unknown function. Such manipulation leads to information disclosure. This vulnerability is documented as CVE-2026-26133. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Microsoft M365 Copilot (affected version unknown). It has been rated as problematic. Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality.

The advisory is available at msrc.microsoft.com. This vulnerability is handled as CVE-2026-26133. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/15/2026). This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202603-2480), EUVD (EUVD-2026-12111) and CERT Bund (WID-SEC-2026-0717). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Microsoft Edge
  • Microsoft 365 Copilot

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.8

VulDB Base Score: 4.3
VulDB Temp Score: 3.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Unproven

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/12/2026 Advisory disclosed
03/12/2026 +0 days VulDB entry created
03/15/2026 +3 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-26133 (🔒)
GCVE (CVE): GCVE-0-2026-26133
GCVE (VulDB): GCVE-100-350666
EUVD: 🔒
CERT Bund: WID-SEC-2026-0717 - Microsoft 365 Copilot und Edge: Schwachstelle ermöglicht Offenlegung von Informationen und Manipulation von Daten
CNNVD: CNNVD-202603-2480 - Microsoft多款产品 安全漏洞

Entryinfo

Created: 03/12/2026 15:38
Updated: 03/15/2026 19:34
Changes: 03/12/2026 15:38 (48), 03/13/2026 15:00 (6), 03/13/2026 23:28 (7), 03/13/2026 23:42 (1), 03/14/2026 18:58 (1), 03/15/2026 19:34 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

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