Vulnerability Details CVE-2020-26938
In oauth2-server (aka node-oauth2-server) through 3.1.1, the value of the redirect_uri parameter received during the authorization and token request is checked against an incorrect URI pattern ("[a-zA-Z][a-zA-Z0-9+.-]+:") before making a redirection. This allows a malicious client to pass an XSS payload through the redirect_uri parameter while making an authorization request. NOTE: this vulnerability is similar to CVE-2020-7741.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 32.4%
CVSS Severity
CVSS v3 Score 7.2
References
- https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js#L143
- https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js#L12
- https://github.com/oauthjs/node-oauth2-server/issues/637
- https://tools.ietf.org/html/rfc3986#section-3
- https://tools.ietf.org/html/rfc6749#section-3.1.2
- https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js#L143
- https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js#L12
- https://github.com/oauthjs/node-oauth2-server/issues/637
- https://tools.ietf.org/html/rfc3986#section-3
- https://tools.ietf.org/html/rfc6749#section-3.1.2
Products affected by CVE-2020-26938
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cpe:2.3:a:oauth2-server_project:oauth2-server:-
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cpe:2.3:a:oauth2-server_project:oauth2-server:2.2.2
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cpe:2.3:a:oauth2-server_project:oauth2-server:2.3.0
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cpe:2.3:a:oauth2-server_project:oauth2-server:2.4.0
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cpe:2.3:a:oauth2-server_project:oauth2-server:2.4.1
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cpe:2.3:a:oauth2-server_project:oauth2-server:3.0.0
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cpe:2.3:a:oauth2-server_project:oauth2-server:3.0.1
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cpe:2.3:a:oauth2-server_project:oauth2-server:3.0.2
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cpe:2.3:a:oauth2-server_project:oauth2-server:3.1.0
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cpe:2.3:a:oauth2-server_project:oauth2-server:3.1.1