CVE-2026-73421

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (49th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

NextAuth.js provides authentication for Next.js. From next-auth 5.0.0-beta.0 until 5.0.0-beta.32, applications that gate access by checking only for the existence of the auth object returned by the auth() wrapper can fail open when Auth.js has a server configuration error. In middleware, Route Handlers, React Server Components, and other auth() entry points, a non-OK session response is parsed into a truthy error object instead of null, so checks such as !!auth and if (req.auth) evaluate to true for unauthenticated requests. A provider missing both the issuer and authorization endpoint triggers InvalidEndpoints, and an unset AUTH_SECRET or another server configuration error can produce the same behavior. There is no impact while configuration is valid, but after a deployment becomes misconfigured, routes protected only by session existence silently grant access to every visitor. This issue is fixed in next-auth 5.0.0-beta.32.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
49th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 23, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

Configuration errors can cause existence-based auth checks to fail open (auth object populated with an error) · Advisory · nextauthjs/next-auth · GitHub

https://github.com/nextauthjs/next-auth/security/advisories/GHSA-8fpg-xm3f-6cx3
github_release Patch Available

[email protected]

Patch available: nextauthjs/next-auth [email protected] (pre-release)

https://github.com/nextauthjs/next-auth/releases/tag/[email protected]
github_commit Patch Available

commit d008b9b764bf (nextauthjs/next-auth)

Patch available: nextauthjs/next-auth @auth/[email protected] (contains commit d008b9b764bf)

https://github.com/nextauthjs/next-auth/commit/d008b9b764bf4b322a87e1822d1dda7789258d8f

Vendor Advisories for CVE-2026-73421(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
next-auth—
  • 5.0.0-beta.0 up to 5.0.0-beta.32: fixed in 5.0.0-beta.32
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-04 08:21 UTCEG score recompute
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 03:25 UTCEG score recompute
  10. 2026-10-01 19:50 UTCEPSS rescore
  11. 2026-10-01 06:17 UTCEG score recompute
  12. 2026-09-29 15:24 UTCEPSS rescore
  13. 2026-09-28 13:52 UTCEPSS rescore
  14. 2026-09-28 05:06 UTCEG score recompute
  15. 2026-09-27 13:48 UTCEPSS rescore
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-23 22:21 UTCEG score recompute
  18. 2026-09-23 17:54 UTCEPSS rescore
  19. 2026-09-22 22:43 UTCEG score recompute
  20. 2026-09-21 21:09 UTCEPSS rescore
  21. 2026-09-20 20:16 UTCEPSS rescore
  22. 2026-09-20 01:47 UTCEG score recompute
  23. 2026-09-18 20:11 UTCEG score recompute
  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 03:06 UTCEG score recompute
Show 66 more
  1. 2026-09-17 02:02 UTCEG score recompute
  2. 2026-09-16 14:08 UTCEPSS rescore
  3. 2026-09-16 06:47 UTCEG score recompute
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-13 22:22 UTCEG score recompute
  7. 2026-09-12 19:17 UTCEG score recompute
  8. 2026-09-12 15:02 UTCEPSS rescore
  9. 2026-09-11 16:45 UTCEG score recompute
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-10 15:10 UTCEG score recompute
  12. 2026-09-10 09:35 UTCEPSS rescore
  13. 2026-09-09 08:56 UTCEG score recompute
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-07 21:30 UTCEG score recompute
  16. 2026-09-06 17:35 UTCEG score recompute
  17. 2026-09-06 13:48 UTCEPSS rescore
  18. 2026-09-05 19:28 UTCEG score recompute
  19. 2026-09-04 17:42 UTCEG score recompute
  20. 2026-09-04 13:16 UTCEG score recompute
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 23:22 UTCEG score recompute
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-08-30 19:19 UTCEG score recompute
  28. 2026-08-30 19:18 UTCEPSS rescore
  29. 2026-08-30 19:17 UTCEPSS rescore
  30. 2026-08-30 04:58 UTCEG score recompute
  31. 2026-08-30 01:22 UTCEPSS rescore
  32. 2026-08-30 00:33 UTCEG score recompute
  33. 2026-08-28 21:42 UTCEPSS rescore
  34. 2026-08-27 14:46 UTCEG score recompute
  35. 2026-08-27 14:25 UTCEPSS rescore
  36. 2026-08-26 15:10 UTCEG score recompute
  37. 2026-08-26 14:47 UTCEPSS rescore
  38. 2026-08-25 16:14 UTCEG score recompute
  39. 2026-08-25 13:49 UTCEPSS rescore
  40. 2026-08-24 18:11 UTCEG score recompute
  41. 2026-08-24 12:18 UTCEG score recompute
  42. 2026-08-23 04:23 UTCEG score recompute
  43. 2026-08-23 00:19 UTCEPSS rescore
  44. 2026-08-22 01:50 UTCEG score recompute
  45. 2026-08-21 23:49 UTCEPSS rescore
  46. 2026-08-20 23:19 UTCEG score recompute
  47. 2026-08-20 22:56 UTCEPSS rescore
  48. 2026-08-19 20:33 UTCEG score recompute
  49. 2026-08-19 17:04 UTCEPSS rescore
  50. 2026-08-18 18:59 UTCEG score recompute
  51. 2026-08-18 13:49 UTCEPSS rescore
  52. 2026-08-18 13:49 UTCEPSS rescore
  53. 2026-08-18 02:21 UTCEG score recompute
  54. 2026-08-17 14:42 UTCEG score recompute
  55. 2026-08-17 13:47 UTCEPSS rescore
  56. 2026-08-16 16:41 UTCEG score recompute
  57. 2026-08-16 14:56 UTCEPSS rescore
  58. 2026-08-16 14:56 UTCEPSS rescore
  59. 2026-08-16 03:23 UTCEG score recompute
  60. 2026-08-16 02:15 UTCEPSS rescore
  61. 2026-08-15 05:19 UTCEG score recompute
  62. 2026-08-15 01:31 UTCEPSS rescore
  63. 2026-08-13 22:25 UTCEG score recompute
  64. 2026-08-13 22:09 UTCEG score recompute▲ 9.10
  65. 2026-08-13 22:09 UTCMITRE cvelistV5CVSS v3 → 9.1 · CVSS v4 → 9.1
  66. 2026-08-12 21:21 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-73421?
CVE-2026-73421 is a critical vulnerability published on July 23, 2026. NextAuth.js provides authentication for Next.js. From next-auth 5.0.0-beta.0 until 5.0.0-beta.32, applications that gate access by checking only for the existence of the auth object returned by the auth() wrapper can fail open when Auth.js has a server configuration error. In middleware, Route…
When was CVE-2026-73421 disclosed?
CVE-2026-73421 was first published on July 23, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73421 actively exploited?
CVE-2026-73421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73421?
CVE-2026-73421 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73421?
A fix for CVE-2026-73421 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73421 are linked in the Vendor Advisories panel on this page.

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