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CVE-2026-40155
Auth0 Next.js SDK has Improper Proxy Cache Lookup
Medium5.4EPSS 0.21%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N |
| NVDNVD · Analyzed | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.
Weakness
Affected products
- affected >= 4.12.0, < 4.18.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@auth0/nextjs-auth0GHSA-xq8m-7c5p-c2r6 (opens in a new tab)
References (3)
- https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978 (opens in a new tab)x_refsource_MISC
- https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-xq8m-7c5p-c2r6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-40155)Record last updated .