CVE-2026-45459

CVE-2026-45459

Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

secure@microsoft.com

Frequently asked questions

What is CVE-2026-45459?: CVE-2026-45459 is a low-severity vulnerability, classified under Protection Mechanism Failure. CVSS score: 3.3/10. Published 2026-06-09.
How severe is CVE-2026-45459?: Low severity. CVSS v3 base score is 3.3 out of 10.