IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the…
Priority LOW 30CWE-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 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the redirect URI on the authorization response page, which might lead to XSS in some configurations.
Why it matters now
EPSS 0.01215 68th percentileScored 2026-11-07
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:*:*:*:*:*:*:*:* | 1.0.0 – 1.5.2; 2.0.0 – 2.1.2 | Vulnerable | Identityserver |
- cpe:2.3:a:identityserver:identityserver4:*:*:*:*:*:*:*:* Versions 1.0.0 – 1.5.2; 2.0.0 – 2.1.2 Vulnerable ·Identityserver
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-8899
- 2026-10-03 Alias added: GHSA-mvpr-3vvr-7vqx
References
Patch 1
More Identityserver4 vulnerabilities
- TI-2019-09138 IdentityServer IdentityServer4 through 2.4 has stored XSS via the httpContext to the… CVSS 3.0MEDIUM 6.1
Sources
- CVE-2018-8899 · CVE Program
- CVE-2018-8899 · NVD
- FIRST EPSS
- GHSA-mvpr-3vvr-7vqx · 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