Type Vulnerability
Changes made to the security updates links and information.
Microsoft
Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network
CVE-2026-118746
What this means
This is rated medium severity (6.8 out of 10). There is no confirmed exploitation of it yet.
Full vendor description
Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Scoring and exploitation
6.8/ 10
CVSS 3.1 base scoreMedium
Exploitable over the network without any account, under specific conditions, but only if a user takes an action, such as opening a file or link. High impact on confidentiality and integrity.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityHighAC:H
Privileges requiredNonePR:N
User interactionRequiredUI:R
ScopeUnchangedS:U
Impact
Longer bar: more harm
ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityNoneA:N
- Not reported
- Exploited in the wild
- Not confirmed in the
- Not reported
Weaknesses
CWE-636
References
1 link from the CVE record, grouped by site.
msrc.microsoft.com1 link