XSS in Auth0 Nextjs-Auth0
CVE-2021-32702
The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before and including `1.4.1` are vulnerable to reflected XSS. An attacker can execute arbitrary code by providing an XSS payload in the `error` query parameter which is then processed by the callback handler as an error message. You are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `1.4.1` or lower **unless** you are using custom error handling that does not return the error message in an HTML response. Upgrade to version `1.4.1` to resolve. The fix adds basic HTML escaping to the error message and it should not impact your users.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.014 (69.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Auth0 Nextjs-auth0 — versions < 1.4.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-32702?
- CVE-2021-32702 is a high-severity vulnerability in Auth0 Nextjs-Auth0, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2021-06-25.
- How severe is CVE-2021-32702?
- High severity. CVSS v3 base score is 8.0 out of 10.