# CVE-2026-47892: Spring Framework header predicate bypass in WebFlux functional endpoints

Source: https://junglewise.ai/threats/cve-2026-47892-spring-framework-header-predicate-bypass-in-webflux-functional  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-27. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-47892 · Severity: critical · CVSS 9.8 · Published 2026-08-27

Spring Framework, a widely-used Java web application framework, contains a vulnerability in its WebFlux component that allows attackers to bypass security checks on HTTP requests. When applications use functional endpoints with the DispatcherServlet, an attacker can craft malicious pre-flight requests to circumvent header-based security predicates, potentially gaining unauthorized access to protected resources.

Technologies: [org.springframework:spring-webflux (Maven)](https://junglewise.ai/threats/technologies/org-springframework-spring-webflux). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is CVE-2026-47892 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47892 being exploited in the wild.

**How severe is CVE-2026-47892?** Critical severity, with a CVSS score of 9.8, published 27 August 2026.

**Which products and versions are affected?** org.springframework:spring-webflux (Maven) ECOSYSTEM:introduced=5.2.5.RELEASE,last_affected=5.2.25.RELEASE.

**Is there a fix for CVE-2026-47892?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-47892 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-47892?** Check whether you run org.springframework:spring-webflux (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a header predicate bypass in Spring Framework's WebFlux functional endpoints when deployed with DispatcherServlet. The root cause involves improper validation of HTTP headers during pre-flight request processing, allowing attackers to craft requests that bypass header-based security predicates intended to restrict access. The attack vector is network-based and requires no authentication. An attacker can exploit this by sending specially crafted pre-flight requests to access protected endpoints or resources that should be restricted by header validation rules. Patches are available for affected versions (Spring Framework 5.2.26+, 5.3.50+, 6.0.31+, 6.1.29+, 6.2.20+, and 7.0.9+).

## Affected products

- Spring Spring Framework 5.2.5.RELEASE through 5.2.25.RELEASE, 5.3.0 through 5.3.49, 6.0.0 through 6.0.30, 6.1.0 through 6.1.28, 6.2.0 through 6.2.19, 7.0.0 through 7.0.8

## Identifiers

- CVE-2026-47892
- GHSA-9qf2-26p9-2q2q

## Timeline

- 2026-08-27: disclosed: CVE-2026-47892 published

## References

- [https://spring.io/security/cve-2026-47892](https://spring.io/security/cve-2026-47892)

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