What’s Vulnerable › Vulnerabilities

CVE-2019-12250

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-05-21 · updated 2026-06-17
• Weakness: CWE-79

Description

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

• Identityserver4: through 2.4.0

References

• https://github.com/IdentityServer/IdentityServer4/issues/3279
• https://github.com/IdentityServer/IdentityServer4/issues/3279

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