6.5

CVE-2026-80091: microsoft 365_apps Use of Uninitialized Resource

CVSS: 6.5v3.1MediumAnalyzed
Published 08-09-2026Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2026-80091 is a medium (CVSS 6.5) Use of Uninitialized Resource vulnerability in microsoft 365_apps. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.9% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.92%
0%100%
Low · +0.23 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-09-2026
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information over a network.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.92%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

+0.23 pp

From 0.69% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.92%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft14 products

1 vendor · 14 products

References

1 links