# CVE-2025-29927: Next.js - Authorization Bypass

> Live exploitation tracking for CVE-2025-29927 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-29927

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 9.1
- **Public exploit available:** Yes
- **Affected products:** Vercel Next.js
- **Weaknesses:** CWE-285 (Improper Authorization)
- **Tags:** javascript

## Description

In NextJS React framework prior to 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

## CrowdSec analysis

[CVE-2025-29927](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-29927) is a high-severity vulnerability affecting the NextJS React framework, which allows attackers to bypass authorization checks when these controls are enforced through application middleware.

CrowdSec has been tracking this vulnerability and its exploits since 24th of March 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2025-29927 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting.
CrowdSec network telemetry also shows that exploitation of CVE-2025-29927 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attack patterns are tailored towards application endpoints that rely on middleware-based authorization within NextJS deployments.

## Timeline

- 2025-03-10: CVE Published. CVE-2025-29927 is published to NVD.
- 2025-03-24: Rule Released. CrowdSec releases a rule to detect CVE-2025-29927 exploitation attempts against the CrowdSec Network.
- 2025-03-26: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-29927 for the first time.

## References

- https://lists.apache.org/thread/j5fkjv2k477os90nczf2v9l61fb0kkgq
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-29927.yaml
- https://github.com/vercel/next.js/releases/tag/v13.5.9
- https://github.com/vercel/next.js/releases/tag/v12.3.5
- https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw
- https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48
- https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2
- https://security.netapp.com/advisory/ntap-20250328-0002/

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-29927) follows observed exploitation activity for CVE-2025-29927. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.