Type Vulnerability
Changes made to the security updates links and information.
Microsoft · Auth bypass
Authentication Bypass in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network
CVE-2026-118741
What this means
This is rated high severity (8.1 out of 10). There is no confirmed exploitation of it yet. Ask IT whether the affected products are in your estate.
Full vendor description
Improper authentication in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Scoring and exploitation
8.1/ 10
CVSS 3.1 base scoreHigh
Exploitable over the network without any account, under specific conditions, and no one has to click or open anything. High impact on confidentiality, integrity and availability.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityHighAC:H
Privileges requiredNonePR:N
User interactionNoneUI:N
ScopeUnchangedS:U
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-640
References
1 link from the CVE record, grouped by site.
msrc.microsoft.com1 link