Security Digest · Vulnerability record
CVE-2026-47892: Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints
A WebFlux application using functional endpoints and deployed with DispatcherServlet may be vulnerable to a header predicate bypass in a pre-flight request.
CVSS 9.8 Critical EPSS 0.5% · p44
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5%, percentile 44: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 44% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
org.springframework:spring-webflux(Maven) >= 5.2.5.RELEASE, <= 5.2.25.RELEASE, no fixed version listed;org.springframework:spring-webflux(Maven) >= 5.3.0, <= 5.3.49, no fixed version listed;org.springframework:spring-webflux(Maven) >= 6.0.0, <= 6.0.30, no fixed version listed;org.springframework:spring-webflux(Maven) >= 6.1.0, <= 6.1.28, no fixed version listed. Check your lockfile, including transitive dependencies.
What it is
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
From the GitHub advisory
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
Weakness type: CWE-863.
Product: org.springframework:spring-webflux (Maven) · Assigned by: vmware · Published: 2026-08-27
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Maven | org.springframework:spring-webflux | >= 5.2.5.RELEASE, <= 5.2.25.RELEASE | none listed |
| Maven | org.springframework:spring-webflux | >= 5.3.0, <= 5.3.49 | none listed |
| Maven | org.springframework:spring-webflux | >= 6.0.0, <= 6.0.30 | none listed |
| Maven | org.springframework:spring-webflux | >= 6.1.0, <= 6.1.28 | none listed |
| Maven | org.springframework:spring-webflux | >= 6.2.0, <= 6.2.19 | none listed |
| Maven | org.springframework:spring-webflux | >= 7.0.0, <= 7.0.8 | 7.0.9 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Spring | Spring Framework | 7.0.0 <= 7.0.8, 6.2.0 <= 6.2.19, 6.1.0 <= 6.1.28, 6.0.0 <= 6.0.30, 5.3.0 <= 5.3.49, 5.2.5.RELEASE <= 5.2.25.RELEASE |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.53% probability of exploitation activity in the next 30 days; percentile 44.
Timeline
- — CVE record published by vmware
- — GitHub-reviewed advisory GHSA-9qf2-26p9-2q2q published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-9qf2-26p9-2q2q github.com
- CVE.org record CVE-2026-47892 cve.org
- NVD entry CVE-2026-47892 nvd.nist.gov
Other references from the CVE record and advisory
- spring.io spring.io