GHSA-55p7-v223-x366
IdentityServer Open Redirect vulnerability
Impact
It is possible for an attacker to craft malicious Urls that certain functions in IdentityServer will incorrectly treat as local and trusted. If such a Url is returned as a redirect, some browsers will follow it to a third-party, untrusted site.
Affected Methods
In the
DefaultIdentityServerInteractionService, theGetAuthorizationContextAsyncmethod may return non-null and theIsValidReturnUrlmethod may return true for malicious Urls, indicating incorrectly that they can be safely redirected to.UI code calling these two methods is the most commonly used code path that will expose the vulnerability. The default UI templates rely on this behavior in the Login, Challenge, and Consent pages. Customized user interface code might also rely on this behavior. The following uncommonly used APIs are also vulnerable:
The
ServerUrlExtensions.GetIdentityServerRelativeUrl,ReturnUrlParser.ParseAsyncandOidcReturnUrlParser.ParseAsyncmethods may incorrectly return non-null, and theReturnUrlParser.IsValidReturnUrlandOidcReturnUrlParser.IsValidReturnUrlmethods may incorrectly return true for malicious Urls.
Patches
IdentityServer4 is no longer supported and will not be receiving updates. Please consider updating to Duende.IdentityServer.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
What each source reports
GitHub Advisories Score used
IdentityServer Open Redirect vulnerability
Impact
It is possible for an attacker to craft malicious Urls that certain functions in IdentityServer will incorrectly treat as local and trusted. If such a Url is returned as a redirect, some browsers will follow it to a third-party, untrusted site.
Affected Methods
In the
DefaultIdentityServerInteractionService, theGetAuthorizationContextAsyncmethod may return non-null and theIsValidReturnUrlmethod may return true for malicious Urls, indicating incorrectly that they can be safely redirected to.UI code calling these two methods is the most commonly used code path that will expose the vulnerability. The default UI templates rely on this behavior in the Login, Challenge, and Consent pages. Customized user interface code might also rely on this behavior. The following uncommonly used APIs are also vulnerable:
The
ServerUrlExtensions.GetIdentityServerRelativeUrl,ReturnUrlParser.ParseAsyncandOidcReturnUrlParser.ParseAsyncmethods may incorrectly return non-null, and theReturnUrlParser.IsValidReturnUrlandOidcReturnUrlParser.IsValidReturnUrlmethods may incorrectly return true for malicious Urls.
Patches
IdentityServer4 is no longer supported and will not be receiving updates. Please consider updating to Duende.IdentityServer.
- Record
GHSA-55p7-v223-x366- CVSS 4.0
- 5.1 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N - CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSV
IdentityServer Open Redirect vulnerability
Impact
It is possible for an attacker to craft malicious Urls that certain functions in IdentityServer will incorrectly treat as local and trusted. If such a Url is returned as a redirect, some browsers will follow it to a third-party, untrusted site.
Affected Methods
In the
DefaultIdentityServerInteractionService, theGetAuthorizationContextAsyncmethod may return non-null and theIsValidReturnUrlmethod may return true for malicious Urls, indicating incorrectly that they can be safely redirected to.UI code calling these two methods is the most commonly used code path that will expose the vulnerability. The default UI templates rely on this behavior in the Login, Challenge, and Consent pages. Customized user interface code might also rely on this behavior. The following uncommonly used APIs are also vulnerable:
The
ServerUrlExtensions.GetIdentityServerRelativeUrl,ReturnUrlParser.ParseAsyncandOidcReturnUrlParser.ParseAsyncmethods may incorrectly return non-null, and theReturnUrlParser.IsValidReturnUrlandOidcReturnUrlParser.IsValidReturnUrlmethods may incorrectly return true for malicious Urls.
Patches
IdentityServer4 is no longer supported and will not be receiving updates. Please consider updating to Duende.IdentityServer.
- Record
GHSA-55p7-v223-x366- CVSS 4.0
- 5.1 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N - CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
IdentityServer4NuGet | through 4.1.2 | None known |
IdentityServer4NuGet | through 4.1.2, plus listed versions 1.0.01.0.0-beta11.0.0-beta1-update11.0.0-beta21.0.0-beta2-update1 Show 45 moreShow less1.0.0-beta2-update21.0.0-beta31.0.0-beta41.0.0-beta4-update11.0.0-beta4-update21.0.0-beta51.0.0-rc11.0.0-rc1-update11.0.0-rc1-update21.0.0-rc21.0.0-rc31.0.0-rc41.0.0-rc4-update11.0.0-rc51.0.11.0.21.1.01.1.11.2.01.2.11.3.01.3.11.4.01.4.11.4.21.5.01.5.11.5.21.5.32.0.02.0.0-preview22.0.0-preview32.0.0-preview42.0.0-rc12.0.0-rc1-update12.0.12.0.22.0.32.0.42.0.52.0.62.0.6-preview12.1.02.1.12.1.2 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-55p7-v223-x366 is a medium vulnerability (CVSS 5.1) in IdentityServer4, published July 31, 2024. No source lists public exploit code. No source names a fixed version.
References
Left out here: 30 versions. The JSON record has them.