🛡️ CVE-2026-55042 — 365-apps

🟡 CVSS 5.5 — Medium ✅ No Known Exploit CWE-908 NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information locally.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-55042 is classified as CWE-908: Use of Uninitialized Resource. A resource is read before being initialised, so its contents are whatever was left there.

Affected software

CVE-2026-55042 is recorded against 6 packages.

  • 365-apps
  • microsoft-365
  • office-2016
  • office-2019
  • office-2021
  • office-2024

Timeline and source

Published on 14 July 2026 and last revised on 16 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

msrc.microsoft.com

Details

Severity MEDIUM
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE CWE-908
Public Exploit ✅ No
Source NVD
Published 2026-07-14
Updated 2026-08-11
Modified 2026-07-16

Affected Packages

Software From version Fixed in
365-apps — —
microsoft-365 — —
office-2016 — —
office-2019 — —
office-2021 — —
office-2024 — —

Similar Threats

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