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CVE-2020-26938

24
FAUCET Score

CVE-2020-26938 is a cross-site scripting (XSS) vulnerability affecting oauth2-server (node-oauth2-server) versions up to 3.1.1. The vulnerability arises from an insufficient URI pattern check on the redirect_uri parameter, allowing a malicious client to inject an XSS payload. This high-severity vulnerability (CVSS 7.2) has a low attack complexity and can lead to partial loss of confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.1.1CPE matchmatch criteria
cpe:2.3:a:oauth2-server_project:oauth2-server:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.2HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.76%
Probability of exploitation in next 30 days
EPSS Percentile
51.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0076 is in the 27th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

npmGHSA-4rg6-fm25-gc34high

oauth2-server through 3.1.1 vulnerable to Open Redirect

Aug 30, 2022

References

github.com / oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js
ExploitThird Party Advisory
github.com / oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js
ExploitThird Party Advisory
github.com / oauthjs/node-oauth2-server/issues/637
Issue TrackingThird Party Advisory
tools.ietf.org / html/rfc3986
Third Party Advisory
tools.ietf.org / html/rfc6749
Third Party Advisory