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CVE-2026-47892 — spring-webflux

CRITICAL

CVE-2026-47892 is a critical-severity (CVSS 9.8) CWE-863 vulnerability in org.springframework:spring-webflux. A fix is available for org.springframework:spring-webflux — see the affected versions and patch details below.

Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints

Published
Updated
Affected
6 pkgs
Patched
1 / 6
Exploits
None indexed
Exploitation data as of Oct 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-47892.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk
0.00%0.34%0.69%1.03%0.4%0.5%0.5%Sep 26Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-47892 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

6 pkgs affected
☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webflux

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

A WebFlux application using functional endpoints and deployed with DispatcherServlet may be vulnerable to a header predicate bypass in a pre-flight request. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28 Spring Framework 6.0.0 - 6.0.30 Spring Framework 5.3.0 - 5.3.49 Spring Framework 5.2.5.RELEASE - 5.2.25.RELEASE

Affected Packages

6 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.springframework:spring-webflux≥ 5.2.5.RELEASENo fix
☕Mavenorg.springframework:spring-webflux≥ 5.3.0No fix
☕Mavenorg.springframework:spring-webflux≥ 6.0.0No fix
☕Mavenorg.springframework:spring-webflux≥ 6.1.0No fix
☕Mavenorg.springframework:spring-webflux≥ 6.2.0No fix
☕Mavenorg.springframework:spring-webflux≥ 7.0.0&&< 7.0.97.0.9org.springframework:spring-webflux:7.0.9

Affected Products

1 product · 6 configurations
Application
spring frameworkvmware
≥ 7.0.0 && < 7.0.8.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.springframework:spring-webflux, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    No patched version of org.springframework:spring-webflux has shipped for CVE-2026-47892 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate
Workaround published by Red Hat
Applications should avoid relying solely on header-based route predicates (headers(...)) in WebFlux functional endpoint configurations to enforce security-relevant access control, since this bypass allows such guards to be circumvented via a crafted CORS pre-flight request. Combining header predicates with a dedicated authentication/authorization layer (e.g., Spring Security) prevents exploitation of this specific issue. For Red Hat Fuse 7, which is in Extended Life Support Phase 2 and will not receive a fix for this issue, this configuration- based guidance is the only available mitigation.
Source: Red Hat security advisory for CVE-2026-47892 (CC BY 4.0)

Frequently Asked Questions

A WebFlux application using functional endpoints and deployed with DispatcherServlet may be vulnerable to a header predicate bypass in a pre-flight request. Spring Framework 7.0.0 - 7.0.8 Spring Framework 6.2.0 - 6.2.19 Spring Framework 6.1.0 - 6.1.28 Spring Framework 6.0.0 - 6.0.30 Spring Framework 5.3.0 - 5.3.49 Spring Framework 5.2.5.RELEASE - 5.2.25.RELEASE
O3 Security · Impact-Aware SCA

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CVE-2026-47892: spring-webflux — Fixed in 7.0.9