CVE-2026-97011: microsoft 365_apps Use of Uninitialized Resource
CVSS: 8.8v3.1HighAnalyzed
Published 13-10-2026Last modified 19-10-2026
Vulnerability summary
CVE-2026-97011 is a high (CVSS 8.8) Use of Uninitialized Resource vulnerability in microsoft 365_apps. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.1% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
0.72%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 13-10-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.72%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
14-10-202620-10-2026
EPSS score0.72%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-908Use of Uninitialized ResourceThe product uses or accesses a resource that has not been initialized.
- CWE-763Release of Invalid Pointer or ReferenceThe product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.
Affected systems
Microsoft10 products
- 365_appsna
- microsoft_365na
- microsoft 365 apps for enterprise≥ 16.0.1, < https://aka.ms/OfficeSecurityReleases
- microsoft office 365 for mac≥ 1.0.0, < 16.114.26101123
- microsoft office ltsc 2021≥ 16.0.1, < 16.0.14334.20974
1 vendor · 10 products
