Microsoft 365 Copilot improper validation of specified type of input

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability was found in Microsoft 365 Copilot. It has been declared as problematic. This impacts an unknown function. The manipulation results in improper validation of specified type of input. This vulnerability is identified as CVE-2026-24307. The attack can be executed remotely. There is not any exploit available. This product is a managed service. It is not possible for users to maintain vulnerability countermeasures themselves.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Microsoft 365 Copilot (version now known). Affected is some unknown processing. The manipulation with an unknown input leads to a improper validation of specified type of input vulnerability. CWE is classifying the issue as CWE-1287. The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type. This is going to have an impact on confidentiality. CVE summarizes:

Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.

The advisory is shared for download at msrc.microsoft.com. This vulnerability is traded as CVE-2026-24307 since 01/21/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 02/12/2026).

This product is available as a managed service. Users are not able to maintain vulnerability countermeasures themselves.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202601-3925), EUVD (EUVD-2026-4497) and CERT Bund (WID-SEC-2026-0201). Once again VulDB remains the best source for vulnerability data.

Affected

  • Microsoft Azure
  • Microsoft 365 Copilot
  • Microsoft Entra

Productinfo

Vendor

Name

License

Managed Service

  • yes

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 7.0

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

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 9.3
CNA Vector (microsoft): 🔒

CVSSv2info

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

Exploitinginfo

Class: Improper validation of specified type of input
CWE: CWE-1287 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/21/2026 CVE reserved
01/23/2026 +2 days Advisory disclosed
01/23/2026 +0 days VulDB entry created
02/12/2026 +20 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-24307 (🔒)
GCVE (CVE): GCVE-0-2026-24307
GCVE (VulDB): GCVE-100-342516
EUVD: 🔒
CERT Bund: WID-SEC-2026-0201 - Microsoft Azure, Copilot und Entra: Mehrere Schwachstellen
CNNVD: CNNVD-202601-3925 - Microsoft M365 Copilot 安全漏洞

Entryinfo

Created: 01/23/2026 08:11
Updated: 02/12/2026 19:38
Changes: 01/23/2026 08:11 (60), 01/23/2026 15:25 (6), 01/24/2026 04:39 (7), 01/24/2026 12:59 (1), 01/25/2026 14:14 (1), 01/25/2026 15:30 (1), 02/12/2026 19:38 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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