Vulnerability

CVE-2026-45487

High· 7.8CVSS7.8EPSS0%

.rules3/5

Time-of-check time-of-use (TOCTOU) race condition in Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

Threat signal

78/100

High

Severity

high

CVSS

7.8

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

7.8/ 10HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredLowStandard user privileges sufficient.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.05%

probability of exploitation in next 30 days

p16

higher than 16% of all CVEs

3-day trend↓ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-45487. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCTrack

Total impact on non-trivial mission systems

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

Lifecycle

2026-06-09Vendor advisory · microsoftCVE-2026-45487 — Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerabi
2026-06-09Published
2026-06-11Last modified1 source

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

microsoftCVE-2026-45487Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45487

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