CVE-2025-29927

CRITICALNVD 9.19.1
EchelonGraph scoreLOW confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 99.3%, top 0% of all CVEs by exploit prediction. 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, nvd
Weaponized
9.1
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 99%
CISA-KEV: Not listedEPSS: 99%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.

CVSS v3
9.1
EG Score
9.1(low)
EG Risk
96(Track)
EG Risk 96/100SSVC: Track

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%
Exploitation99% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
99.9%
KEV
Not listed

Published

March 21, 2025

Last Modified

September 10, 2025

Advisory Details (8)

Auto-updated Jul 23, 2026
Patch available. Sources: github_commit, github_release, github.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20250328-0002/
generic

oss-security - Re: CVE-2025-29927: Authorization Bypass in Next.js Middleware

http://www.openwall.com/lists/oss-security/2025/03/23/4
generic

oss-security - CVE-2025-29927: Authorization Bypass in Next.js Middleware

http://www.openwall.com/lists/oss-security/2025/03/23/3
github Patch Available

Authorization Bypass in Next.js Middleware · Advisory · vercel/next.js · GitHub

Affected: 13.5.9

https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw
github_release Patch Available

v13.5.9

Patch available: vercel/next.js v13.5.9

https://github.com/vercel/next.js/releases/tag/v13.5.9
github_release Patch Available

v12.3.5

Patch available: vercel/next.js v12.3.5

https://github.com/vercel/next.js/releases/tag/v12.3.5
github_commit

commit 5fd3ae8f8542 (vercel/next.js)

Fix landed in vercel/next.js commit 5fd3ae8f8542 — awaiting tagged release

https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48
github_commit

commit 52a078da3884 (vercel/next.js)

Fix landed in vercel/next.js commit 52a078da3884 — awaiting tagged release

https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
next—12.3.5—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 1× in last 7d / 7× 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. 2026-07-23 02:52 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-09 19:09 UTCEPSS rescore
  5. 2026-07-07 06:51 UTCOSV refresh
  6. 2026-06-24 14:04 UTCEPSS rescore
  7. 2026-06-24 14:04 UTCEPSS rescore
  8. 2026-06-22 14:25 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
  10. 2026-06-18 18:05 UTCOSV refresh
  11. 2026-06-17 17:52 UTCEPSS rescore
  12. 2026-06-15 17:48 UTCEPSS rescore
  13. 2026-06-12 23:11 UTCEPSS rescore
  14. 2026-06-10 22:18 UTCEPSS rescore
  15. 2026-06-08 14:16 UTCEPSS rescore
  16. 2026-06-08 14:16 UTCEPSS rescore
  17. 2026-06-07 15:24 UTCEPSS rescore
  18. 2026-06-07 15:24 UTCEPSS rescore
  19. 2026-06-06 13:47 UTCEPSS rescore
  20. 2026-06-06 13:47 UTCEPSS rescore
  21. 2026-06-05 06:10 UTCEPSS rescore
  22. 2026-06-05 06:10 UTCEPSS rescore
  23. 2026-06-02 20:12 UTCEPSS rescore
  24. 2026-05-30 09:03 UTCEG score recompute
  25. 2026-05-29 15:27 UTCOSV refresh
Show 1 more
  1. 2026-05-29 13:44 UTCEPSS rescore

Publicly available exploits

(10 references)

Working exploit code is in the public domain (9 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCUNICORDev/exploit-CVE-2025-29927
    First seen Apr 14, 2025

    Exploit for CVE-2025-29927 (Next.js) - Authorization Bypass

    Open source ↗
  • GitHub PoCgotr00t0day/CVE-2025-29927
    First seen Apr 6, 2025

    Next.js Middleware Bypass Scanne

    Open source ↗
  • Exploit-DBEDB-52124
    First seen Apr 5, 2025

    Next.js Middleware 15.2.2 - Authorization Bypass

    Open source ↗
  • GitHub PoCAnonKryptiQuz/NextSploit
    First seen Mar 28, 2025

    NextSploit is a command-line tool designed to detect and exploit CVE-2025-29927, a security flaw in Next.js

    Open source ↗
  • GitHub PoCKaztoRay/CVE-2025-29927-Research
    First seen Mar 27, 2025

    CVE-2025-29927에 대한 설명 및 리서치

    Open source ↗
  • GitHub PoCkOaDT/poc-cve-2025-29927
    First seen Mar 26, 2025

    This repository contains a proof of concept (POC) and an exploit script for CVE-2025-29927, a critical vulnerability in Next.js that allows attackers to bypass authorization checks implemented in middleware.

    Open source ↗
  • GitHub PoCphoscoder/ghost-route
    First seen Mar 25, 2025

    Ghost Route detects if a Next JS site is vulnerable to the corrupt middleware bypass bug (CVE-2025-29927)

    Open source ↗
  • GitHub PoClirantal/vulnerable-nextjs-14-CVE-2025-29927
    First seen Mar 23, 2025
    Open source ↗
  • GitHub PoCaydinnyunus/CVE-2025-29927
    First seen Mar 23, 2025

    CVE-2025-29927 Proof of Concept

    Open source ↗
  • GitHub PoC6mile/nextjs-CVE-2025-29927
    First seen Mar 23, 2025

    A Nuclei template to detect CVE-2025-29927 the Next.js authentication bypass vulnerability

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-29927?
CVE-2025-29927 is a critical vulnerability published on March 21, 2025. Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a…
When was CVE-2025-29927 disclosed?
CVE-2025-29927 was first published in the National Vulnerability Database on March 21, 2025, with the most recent update on September 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-29927 actively exploited?
CVE-2025-29927 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-29927?
CVE-2025-29927 has a CVSS v3 base score of 9.1 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2025-29927?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-29927, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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