CVE-2026-83785: Windows COM+ Event System Service Elevation of Privilege Vulnerability
Use after free in Windows COM+ Event System Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows COM+ Event System Service Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
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Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.26300.9711Patch KB5127648
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Systems running the listed Microsoft Windows client or server products are in scope. Exploitation is local, so an attacker must already be able to run with authorized access on the affected system.
What level of access does an attacker need?
The attacker needs local access and low privileges. No user interaction is required, but the attack complexity is rated high.
What could a successful exploit allow?
A successful exploit could allow the authorized local attacker to elevate privileges. The supplied vector also indicates high potential impact to confidentiality, integrity, and availability.
Is there evidence that this vulnerability is being exploited?
The supplied data rates exploit maturity as unknown. It does not state that exploitation has been observed in the wild.