Type Vulnerability
An incorrect authorisation flaw in Core could allow an authorised attacker to gain elevated privileges over a network.
Microsoft
Authorisation Flaw in ASP.NET Core allows an authorized attacker to elevate privileges over a network
CVE-2026-114146
What this means
This is rated critical severity (9 out of 10). There is no confirmed exploitation of it yet. Ask IT whether the affected products are in your estate.
Full vendor description
Incorrect authorization in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Scoring and exploitation
9.0/ 10
CVSS 3.1 base scoreCritical
Exploitable over the network with a low-privilege account, but only if a user takes an action, such as opening a file or link. High impact on confidentiality, integrity and availability, and it can reach beyond the vulnerable system.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityLowAC:L
Privileges requiredLowPR:L
User interactionRequiredUI:R
ScopeChangedS:C
Impact
Longer bar: more harm
ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
- Not reported
- Exploited in the wild
- Not confirmed in the
- Not reported
Weaknesses
CWE-863
References
1 link from the CVE record, grouped by site.
msrc.microsoft.com1 link