CVE-2019-12250

Name: CVE-2019-12250
Creator: NVD / NIST
Published: 2019-05-21T16:29:01.877+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.85%

Last modified Jun 17, 2026

CVE-2019-12250 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

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

Metrics

EPSS Probability

0.85%

53.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Identityserver	Identityserver4	<= 2.4.0

References

https://github.com/IdentityServer/IdentityServer4/issues/3279Exploit, Third Party Advisory
https://github.com/IdentityServer/IdentityServer4/issues/3279Exploit, Third Party Advisory

Timeline

Published: May 21, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-12250?

How severe is CVE-2019-12250?

Severity scoring for CVE-2019-12250 is pending analysis. The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.

How do I fix CVE-2019-12250?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-12250?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST