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CVE-2026-42831

⚠️ high
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Summary

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

CVSS Score
7.8
High
EPSS Score
0.1
Exploit Probability
Published Date
2026-05-12
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.6% of all 326,604 vulnerabilities in our database.

#99,150
Above average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 13, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by CISA
Last Modified 2026-05-22
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-122

📦 Affected Products 5

Vendor Product Status Affected Versions
microsoft office Affected
< 16.0.19822.20190
microsoft office Affected
v2021
microsoft office Affected
v2024
microsoft office_long_term_servicing_channel Affected
v2021
microsoft 365_copilot Affected
< 16.0.19822.20190

🔗 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-2026-42827 🔶 medium 6.5 0.1 Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthoriz... 2026-05-22
CVE-2026-40421 🔶 medium 4.3 0.1 Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose... 2026-05-12
CVE-2026-42832 ⚠️ high 7.7 0.1 Improper access control in Microsoft Office allows an unauthorized attacker to perform spoofing locally. 2026-05-12
CVE-2026-35436 ⚠️ high 8.8 0.1 Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally. 2026-05-12
CVE-2026-35440 🔶 medium 5.5 0.0 Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose... 2026-05-12
These CVEs affect the same products