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CVE-2026-40360

⚠️ high
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Summary

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

CVSS Score
7.8
High
EPSS Score
0.1
Exploit Probability
Published Date
2026-05-12
First Seen: 2026-05-20
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.7% of all 321,566 vulnerabilities in our database.

#97,378
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
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-05-19
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-125

📦 Affected Products 6

Vendor Product Status Affected Versions
microsoft excel Affected
v2016
microsoft office Affected
v2019
microsoft office_online_server Affected
< 16.0.10417.20128
microsoft 365_apps Affected
v-
microsoft office_long_term_servicing_channel Affected
v2021
microsoft office_long_term_servicing_channel Affected
v2024

🔗 References 1

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

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
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-2026-40359 ⚠️ high 7.8 0.1 Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally. 2026-05-12
CVE-2026-40362 ⚠️ high 7.8 0.1 Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally. 2026-05-12
CVE-2026-40421 🔶 medium 4.3 0.1 External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information o... 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-2026-35436 ⚠️ high 8.8 0.1 Insufficient granularity of access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate pri... 2026-05-12
These CVEs affect the same products