Is there a public exploit for CVE-2026-55056?

No public exploit for CVE-2026-55056 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-55056?

CVE-2026-55056 scores CVSS 7.8 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.47%.

What does CVE-2026-55056 affect?

CVE-2026-55056 affects Microsoft Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC 2024, Microsoft Office LTSC for Mac 2021, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 2016.

7.8 High

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

CVE-2026-55056

Assessment

CVSS: 7.8 (v3.1)
Severity: High
EPSS: 0.47% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 14 July 2026
Last updated: 1 November 2026
Affected: Microsoft · Microsoft 365 Apps for Enterprise · Microsoft Office 2016 · Microsoft Office 2019 · Microsoft Office 365 for Mac
Assigner: microsoft

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

At the source

EUVD (ENISA)

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55056

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