Open Redirect in Oauth2-Server Project
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.010 (60.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/oauthjs/node-oauth2-server/issues/637 (Third Party Advisory, Issue Tracking)
- github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd4… (Exploit, Third Party Advisory)
- github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd4… (Exploit, Third Party Advisory)
- tools.ietf.org/html/rfc3986 (Third Party Advisory)
- tools.ietf.org/html/rfc6749 (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-26938?
- CVE-2020-26938 is a high-severity vulnerability in Oauth2-Server Project, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 7.2/10. Published 2022-08-29.
- How severe is CVE-2020-26938?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2020-26938 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.