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High, CVSS 7.2amended

oauth2-server through 3.1.1 vulnerable to Open Redirect

CVE-2020-26938GHSA-4rg6-fm25-gc34

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm oauth2-server

    Affected
    <= 3.1.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
EPSS
  • CVE-2020-26938: 0.99% estimated exploitation activity in the next 30 days; percentile 62.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

In oauth2-server (aka node-oauth2-server) through 3.1.1, the value of the redirecturi 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 redirecturi parameter while making an authorization request. NOTE: this vulnerability is similar to CVE-2020-7741.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-4rg6-fm25-gc34

  2. Revision 1 · created ·

    Published from osv record GHSA-4rg6-fm25-gc34

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2020-26938

Advisory: oauth2-server through 3.1.1 vulnerable to Open Redirect
IDs: CVE-2020-26938, GHSA-4rg6-fm25-gc34
Record: https://patchnext.com/advisories/cve-2020-26938 (revision 2, source checked 26 Oct 2026, 12:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm oauth2-server: affected <= 3.1.1

## Suggested inspection (read-only)
- `npm ls oauth2-server --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on oauth2-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-4rg6-fm25-gc34 (OSV record GHSA-4rg6-fm25-gc34 lists affected ranges: npm oauth2-server >=0 <=3.1.1)
- Verified: https://github.com/advisories/GHSA-4rg6-fm25-gc34 (GitHub-reviewed advisory GHSA-4rg6-fm25-gc34 lists affected ranges: npm oauth2-server >=0 <=3.1.1)

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