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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.014 (71.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Auth0 Nextjs-Auth0 — versions < 1.4.2
Weakness classification (CWE)
References
- github.com/auth0/nextjs-auth0/security/advisories/GHSA-954c-jjx6-cxv7 (Third Party Advisory)
- github.com/auth0/nextjs-auth0/commit/6996e2528ceed98627caa28abafbc09e90163ccf (Patch, Third Party Advisory)
- www.npmjs.com/package/@auth0/nextjs-auth0
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.