Vulnerability

CVE-2026-45459

Low· 3.3CVSS3.3EPSS0%

.rules3/5

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

Threat signal

33/100

Guarded

Severity

low

CVSS

3.3

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

3.3/ 10LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactLowSome data disclosure; attacker doesn't fully control what.
Integrity ImpactNoneNo integrity impact.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.06%

probability of exploitation in next 30 days

p18

higher than 18% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-45459. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-09Vendor advisory · microsoftCVE-2026-45459 — Microsoft Excel Security Feature Bypass Vulnerability
2026-06-09Published
2026-06-11Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

microsoftCVE-2026-45459Microsoft Excel Security Feature Bypass Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45459

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.