CVE-2026-83951: Microsoft Office Word Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-83951

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-09-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83951

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-2026-839510.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-83951	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[NEU] [hoch] Microsoft Office Produkte: Mehrere Schwachstellencert-bund
unknownMultiples vulnérabilités dans Microsoft Office (09 septembre 2026)cert-fr-avis
mediumCVE-2026-83951: Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose informat…nvd

Recent advisories for Microsoft Office Word

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-2026-83951: Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose informat…nvd · 2026-09-08
mediumCVE-2026-83949: Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose informat…nvd · 2026-09-08
highCVE-2026-81952: Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute…nvd · 2026-09-08
mediumCVE-2026-80090: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose inform…nvd · 2026-09-08
mediumCVE-2026-80088: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose inform…nvd · 2026-09-08
highCVE-2026-80085: Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute…nvd · 2026-09-08