CVE-2026-44817

⚠️ high

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS Score

7.8

High

EPSS Score

0.4

Exploit Probability

Published Date

2026-06-09

First Seen: 2026-06-10

This CVE is Moderate Risk - more severe than 69.6% of all 329,456 vulnerabilities in our database.

#100,230

Above average severity

Severity Percentile

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

SSVC data provided by CISA

Last Modified 2026-06-19

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-843

📦 Affected Products 5

Vendor	Product	Status	Affected Versions
microsoft	excel	Affected	v2016
microsoft	office_online_server	Affected	v-
microsoft	365_apps	Affected	v-
microsoft	office_2019	Affected	v-
microsoft	office_2024	Affected	v-

Vendor Advisory

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-44803	⚠️ high	7.8	0.4	Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.	2026-06-09
CVE-2026-44812	⚠️ high	7.8	0.4	Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.	2026-06-09
CVE-2026-44818	⚠️ high	7.0	0.3	Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally...	2026-06-09
CVE-2026-44820	⚠️ high	7.8	0.4	Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally...	2026-06-09
CVE-2026-44822	⚠️ high	8.2	0.5	Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.	2026-06-09
CVE-2026-44823	⚠️ high	7.8	0.4	Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally...	2026-06-09

These CVEs affect the same products