CVE-2026-109476

ASP.NET Core Information Disclosure Vulnerability

CVE-2026-109476 is fixed in 9 products on 1 platform, first by KB5135241, released November 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.1

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

n/a

<p>Improper encoding or escaping of output in ASP.NET Core allows an unauthorized attacker to disclose information over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
.NET 10.0 installed on Linux	KB5135241	Nov 10, 2026
.NET 10.0 installed on Mac OS	KB5135241	Nov 10, 2026
.NET 10.0 installed on Windows	KB5135241	Nov 10, 2026
.NET 8.0 installed on Linux	KB5135243	Nov 10, 2026
.NET 8.0 installed on Mac OS	KB5135243	Nov 10, 2026
.NET 8.0 installed on Windows	KB5135243	Nov 10, 2026
.NET 9.0 installed on Linux	KB5135242	Nov 10, 2026
.NET 9.0 installed on Mac OS	KB5135242	Nov 10, 2026
.NET 9.0 installed on Windows	KB5135242	Nov 10, 2026

Details

Published
November 10, 2026
Weakness
Improper Encoding or Escaping of Output
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109476

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