CVSS 3.1
7.2 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NCVE-2020-26938
High (7.2) in oauth2-server project oauth2-server. EPSS 1.0% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 1.0% chance of exploitation in the next 30 days; higher than 62% of CVEs (scores of 2026-10-31)
- CWE
- CWE-601
- Published
- Modified
- Record from
- the NVD, synced
Affected
- oauth2-server_project:oauth2-server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4rg6-fm25-gc34 | npm | oauth2-server | <=3.1.1 | no fix published |
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