IdentityServer IdentityServer4 through 2.4 has stored XSS via the httpContext to the…
Priority LOW 29CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
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
Why it matters now
EPSS 0.00848 58th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:identityserver:identityserver4:*:*:*:*:*:*:*:* | up to 2.4.0 | Vulnerable | Identityserver |
- cpe:2.3:a:identityserver:identityserver4:*:*:*:*:*:*:*:* Versions up to 2.4.0 Vulnerable ·Identityserver
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-12250
- 2026-10-03 Alias added: GHSA-jg67-mr48-c26q
References
More Identityserver4 vulnerabilities
- TI-2018-06438 IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the… CVSS 3.0MEDIUM 6.1
Sources
- CVE-2019-12250 · CVE Program
- CVE-2019-12250 · NVD
- FIRST EPSS
- GHSA-jg67-mr48-c26q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences