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High severity8.8NVD Advisory· Published Sep 8, 2026· Updated Sep 8, 2026

CVE-2026-78518

CVE-2026-78518

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Affected products

2

Microsoft/Office Excelllm-fuzzy
Microsoft/Officellm-fuzzy

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78518nvd

News mentions

1

Massive Microsoft Patch Tuesday September 2026 – 973 Vulnerabilities Fixed, Including 2 Zero-Days
Cyber Security News · Sep 8, 2026