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🛡️ CVE-2025-48068 — next

🟡 CVSS 4.3 — Medium ✅ No Known Exploit CWE-1385 NVD
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Information exposure in Next.js dev server due to lack of origin verification

Summary

A low-severity vulnerability in Next.js has been fixed in version 15.2.2. This issue may have allowed limited source code exposure when the dev server was running with the App Router enabled. The vulnerability only affects local development environments and requires the user to visit a malicious webpage while npm run dev is active.

Because the mitigation is potentially a breaking change for some development setups, to opt-in to the fix, you must configure allowedDevOrigins in your next config after upgrading to a patched version. [Learn more](https://nextjs.org/docs/app/api-reference/config/next-config-js/allowedDevOrigins).

Learn more: https://vercel.com/changelog/cve-2025-48068

Credit

Thanks to [sapphi-red](https://github.com/sapphi-red) and [Radman Siddiki](https://github.com/R4356th) for responsibly disclosing this issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2025-48068 is classified as CWE-1385: Missing Origin Validation in WebSockets. The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.

Affected software

CVE-2025-48068 is recorded against 2 packages.

  • next
  • next.js (from 15.0.0 up to 15.2.2)

Timeline and source

Published on 28 May 2025 and last revised on 13 June 2025. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)
vercel.com (Web)

Other advisories for this package

next has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-1385: Missing Origin Validation in WebSockets) in other software:

Details

Severity LOW
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CWE CWE-1385
Public Exploit ✅ No
Source NVD
Published 2025-05-28
Updated 2026-08-20
Modified 2025-06-13
Fix URL N/A

Affected Packages

Software From version Fixed in
next — —
next.js 15.0.0 15.2.2

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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