CVE-2019-12250: Identityserver IDENTITYSERVER4

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

IdentityServer IdentityServer4 through 2.4 has stored XSS via the httpContext to the host/Extensions/RequestLoggerMiddleware.cs LogForErrorContext method, which can be triggered by viewing a log. NOTE: the software maintainer disputes that this is a vulnerability because the request logger is not part of IdentityServer but only our development test host

Affected products

• Identityserver IDENTITYSERVER4: up to and including 2.4.0

Published 2019-05-21. Last modified 2026-06-17.