CVE-2026-55042: Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information locally.

mediumCVSS 5.5CVE-2026-55042

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

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.5
Published: 2026-07-14
Last updated: 2026-07-16
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55042

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-550420.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55042	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedNCSC-2026-0237 [1.02] [H/H] Vulnerabilities Fixed in Microsoft Officencsc-nl
unknownexploitedNCSC-2026-0237 [1.01] [H/H] Vulnerabilities fixed in Microsoft Officencsc-nl
unknownMultiple vulnerabilities in Microsoft Office (July 15, 2026)cert-fr-avis
unknownexploitedNCSC-2026-0237 [1.00] [M/H] Vulnerabilities fixed in Microsoft Officencsc-nl
mediumCVE-2026-55042: Microsoft Office Information Disclosure Vulnerabilitymsrc

Recent advisories for Use of uninitialized

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-17992: Uninitialized Use in Skia in Google Chrome on Windows prior to 151.0.7922.72 allowed a remote …nvd · 2026-07-30
mediumCVE-2026-17968: Uninitialized Use in WebXR in Google Chrome on Android prior to 151.0.7922.72 allowed a remote…nvd · 2026-07-30
mediumCVE-2026-17949: Uninitialized Use in GPU in Google Chrome on Android prior to 151.0.7922.72 allowed a remote a…nvd · 2026-07-30
mediumCVE-2026-17946: Uninitialized Use in Dawn in Google Chrome prior to 151.0.7922.72 allowed a remote attacker wh…nvd · 2026-07-30
mediumCVE-2026-17889: Uninitialized Use in WebXR in Google Chrome prior to 151.0.7922.72 allowed a remote attacker t…nvd · 2026-07-30
mediumCVE-2026-17858: Uninitialized Use in WebNN in Google Chrome on Windows prior to 151.0.7922.72 allowed a remote…nvd · 2026-07-30