GHSA-g5fm-jp9v-2432
HIGHImproper Handling of `callbackUrl` parameter in next-auth
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
next-authnpmDescription
Impact
An attacker can send a request to an app using NextAuth.js with an invalid callbackUrl query parameter, which internally we convert to a URL object. The URL instantiation would fail due to a malformed URL being passed into the constructor, causing it to throw an unhandled error which led to our API route handler timing out and logging in to fail. This has been remedied in the following releases:
next-auth v3 users before version 3.29.5 are impacted. (We recommend upgrading to v4, as v3 is considered unmaintained. See our migration guide)
next-auth v4 users before version 4.5.0 are impacted.
Patches
We've released patches for this vulnerability in:
- v3 -
3.29.5 - v4 -
4.5.0
You can do:
npm i next-auth@latest
or
yarn add next-auth@latest
or
pnpm add next-auth@latest
(This will update to the latest v4 version, but you can change latest to 3 if you want to stay on v3. This is not recommended.)
Workarounds
If for some reason you cannot upgrade, the workaround requires you to rely on Advanced Initialization. Here is an example:
Before:
// pages/api/auth/[...nextauth].js
import NextAuth from "next-auth"
export default NextAuth(/* your config */)
After:
// pages/api/auth/[...nextauth].js
import NextAuth from "next-auth"
function isValidHttpUrl(url) {
try {
return /^https?:/.test(url).protocol
} catch {
return false;
}
}
export default async function handler(req, res) {
if (
req.query.callbackUrl &&
!isValidHttpUrl(req.query.callbackUrl)
) {
return res.status(500).send('');
}
return await NextAuth(req, res, /* your config */)
}
References
This vulnerability was discovered not long after https://github.com/nextauthjs/next-auth/security/advisories/GHSA-q2mx-j4x2-2h74 was published and is very similar in nature.
Related documentation:
- https://next-auth.js.org/getting-started/client#specifying-a-callbackurl
- https://next-auth.js.org/configuration/callbacks#redirect-callback
A test case has been added so this kind of issue will be checked before publishing. See: https://github.com/nextauthjs/next-auth/commit/e498483b23273d1bfc81be68339607f88d411bd6
For more information
If you have any concerns, we request responsible disclosure, outlined here: https://next-auth.js.org/security#reporting-a-vulnerability
Timeline
The issue was reported 2022 June 10th, a response was sent out to the reporter in less than 2 hours, and a patch was published within 3 hours.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | next-auth | all versions | 3.29.5 |
| 📦npm | next-auth | ≥ 4.0.0&&< 4.5.0 | 4.5.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for next-auth. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update next-auth to 3.29.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-g5fm-jp9v-2432 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-g5fm-jp9v-2432 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-g5fm-jp9v-2432. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-g5fm-jp9v-2432 in your dependencies?
O3 detects GHSA-g5fm-jp9v-2432 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.