What’s Vulnerable › Vulnerabilities

CVE-2018-8899

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-22 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Identityserver4: from 1.0.0 through 1.5.2; from 2.0.0 through 2.1.2

References

• https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895
• https://github.com/IdentityServer/IdentityServer4/issues/2164
• https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3
• https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3
• https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895
• https://github.com/IdentityServer/IdentityServer4/issues/2164
• https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3
• https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3

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