GHSA-qxrj-hx23-xp82

Suggest an improvement
Source
https://github.com/advisories/GHSA-qxrj-hx23-xp82
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-qxrj-hx23-xp82/GHSA-qxrj-hx23-xp82.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-qxrj-hx23-xp82
Aliases
Published
2023-12-11T21:46:21Z
Modified
2026-09-10T03:50:04Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
Summary
Overly permissive origin policy
Details

Currently, the middleware operates in a way that if an allowed origin is not provided, it will return an Access-Control-Allow-Origin header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware.

If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it.

Database specific 
{
    "cwe_ids":  [
        "CWE-346"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2023-12-11T21:46:21Z",
    "nvd_published_at":  "2023-12-11T23:15:07Z",
    "severity":  "HIGH"
}
References

Affected packages

npm / @koa/cors

Package

Name
@koa/cors
View open source insights on deps.dev
Purl
pkg:npm/%40koa/cors

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.0.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/12/GHSA-qxrj-hx23-xp82/GHSA-qxrj-hx23-xp82.json"