CVE-2026-42827

🔶 medium

Summary

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CVSS Score

6.5

Medium

EPSS Score

0.1

Exploit Probability

Published Date

2026-05-22

First Seen: 2026-05-27

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 47.8% of all 326,604 vulnerabilities in our database.

#170,379

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 26, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

SSVC data provided by CISA

Last Modified 2026-05-27

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-77

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
microsoft	365_copilot	Affected	v-

🔗 References 1

https://msrc.microsoft.com/update-guide/vulnerabilit...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-41090	⛔ critical	9.3	0.1	Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unaut...	2026-05-22
CVE-2026-41100	🔶 medium	4.4	0.0	Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.	2026-05-12
CVE-2026-41614	🔶 medium	6.2	0.0	Improper access control in M365 Copilot for Desktop allows an unauthorized attacker to perform spoofing locally.	2026-05-12
CVE-2026-42831	⚠️ high	7.8	0.1	Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.	2026-05-12
CVE-2026-40363	⚠️ high	8.4	0.1	Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.	2026-05-12
CVE-2026-24299	🔶 medium	5.3	0.0	Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthoriz...	2026-03-19

These CVEs affect the same products