CVE-2026-78506CWE-170

CVE-2026-78506

Medium · published September 8, 2026

CVSS v3.1
5.5
EPSS
1%
Percentile
44.7
In the wild
Unconfirmed
What it is

Improper null termination in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00541 · 44.7th percentile
Weakness
CWE-170 · Improper Null Termination
Published
2026-09-08T22:20Z
Affected products (13)
ProductVersionsFixed in
microsoft/365_appsall versions—
microsoft/365_appsall versions—
microsoft/microsoft_365all versions—
microsoft/office_2019all versions—
microsoft/office_2019all versions—
microsoft/office_2021all versions—
microsoft/office_2021all versions—
microsoft/office_2021all versions—
microsoft/office_2024all versions—
microsoft/office_2024all versions—
microsoft/office_2024all versions—
microsoft/wordall versions—
microsoft/wordall versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78506 · [email protected]
EPSS history
Timeline
  • 10 SEP 03:18Z
    EPSS moved — → 1%
    epss
  • 08 SEP 17:18Z
    Microsoft Office Word Information Disclosure Vulnerability
    cvelistv5