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CVE-2026-40155

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:482887ee464cbb377889e730a31a310ef7361bace18d64df4b9ffacf5a6e5a7d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"nextjs-auth0","vendor":"auth0","versions":[{"status":"affected","version":">= 4.12.0, < 4.18.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978","tags":["x_refsource_MISC"],"url":"https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/references/1
{"name":"https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0","tags":["x_refsource_MISC"],"url":"https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/references/2
{"name":"https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae4a4d4c65d2931f6d975fa192d5ef65264a41485e44d1627bbe34329068d3d6 · sha256:325ee7357a083d44… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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