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CVE-2020-26938

Date: August 29, 2022

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.

Language: JS

Severity Score

Related Resources (8)

https://tools.ietf.org/html/rfc6749#section-3.1.2
https://github.com/oauthjs/node-oauth2-server/issues/637
https://nvd.nist.gov/vuln/detail/CVE-2020-26938
https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js#L143
https://tools.ietf.org/html/rfc3986#section-3
https://github.com/oauthjs/node-oauth2-server
https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js#L12
https://www.mend.io/vulnerability-database/CVE-2020-26938

Severity Score

Weakness Type (CWE)

URL Redirection to Untrusted Site ('Open Redirect')

CWE-601

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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