CVE-2026-56176: microsoft microsoft office 365 for mac Out-of-bounds Read
CVSS: 7.8v3.1HighAnalyzed
Published 14-07-2026Last modified 08-10-2026
Vulnerability summary
CVE-2026-56176 is a high (CVSS 7.8) Out-of-bounds Read vulnerability in microsoft microsoft office 365 for mac. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 25.1% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.33%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 14-07-2026PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
Description
Out-of-bounds read in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
25%
Versus all other CVEs
30-day change
0.00 pp
From 0.33% on 20-09-2026
20-09-202620-10-2026
EPSS score0.33%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft29 products
- microsoft office 365 for mac≥ 1.0.0, < 16.111.26071215
- microsoft office for android≥ 16.0.1, < 16.0.20228.20042
- microsoft office ltsc for mac 2021≥ 16.0.1, < 16.111.26071215
- microsoft office ltsc for mac 2024≥ 16.0.0, < 16.111.26071215
- windows_10_1607< 10.0.14393.9339
1 vendor · 29 products
