CVE-2018-8899
UnknownEPSS 1.26%
Last modified
CVE-2018-8899 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.26% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Identityserver | Identityserver4 | >= 1.0.0, <= 1.5.2 |
| Identityserver | Identityserver4 | >= 2.0.0, <= 2.1.2 |
References
- https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895Patch, Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/issues/2164Issue Tracking, Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895Patch, Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/issues/2164Issue Tracking, Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3Third Party Advisory
- https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2018-8899?
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.
How severe is CVE-2018-8899?
Severity scoring for CVE-2018-8899 is pending analysis. The EPSS model estimates a 1.26% probability of exploitation in the next 30 days.
How do I fix CVE-2018-8899?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2018-8899?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST