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.
Does this matter?
Lower severity and a low EPSS score (1.21%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 6.1 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.21% probability · 68th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- identityserver/identityserver4
- Source
- cve@mitre.org
EPSS 1.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.