Vulnerability · Published Aug 29, 2022 · Assigned by mitre
CVE-2020-26938
High 7.2
In plain English
A high-severity security flaw in the oauth2-server package (npm). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities).
Severity (CVSS NVD)7.2High
Exploit odds (30 days)1.0%top 37.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | oauth2-server | no fix listed | GHSA-4rg6-fm25-gc34 |
Affected products (as reported)
References
- https://github.com/oauthjs/node-oauth2-server/issues/637 x_refsource_MISC
- https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js#L12 x_refsource_MISC
- https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js#L143 x_refsource_MISC
- https://tools.ietf.org/html/rfc3986#section-3 x_refsource_MISC
- https://tools.ietf.org/html/rfc6749#section-3.1.2 x_refsource_MISC