---
title: "CVE-2025-41243: Spring Expression language property modification using Spring Cloud Gateway Server WebFlux"
url: https://erroneo.us/security/cve/CVE-2025-41243/
description: "CVE-2025-41243 (org.springframework.cloud:spring-cloud-gateway-server-webflux (Maven)): Spring Cloud Gateway Server Webflux may be vulnerable to Spring…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-09-16
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-41243"
kev: false
cvss: 10
epss: 0.03548
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-41243: Spring Expression language property modification using Spring Cloud Gateway Server WebFlux

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- 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 3.5% , percentile 89: FIRST’s model estimates a 3.5% chance of exploitation activity in the next 30 days, higher than 89% of all scored CVEs (elevated). 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.cloud:spring-cloud-gateway-server-webflux (Maven) >= 3.1.0, <= 3.1.10, no fixed version listed ; org.springframework.cloud:spring-cloud-gateway-server-webflux (Maven) >= 4.0.0, <= 4.1.10, no fixed version listed ; org.springframework.cloud:spring-cloud-gateway-server-webflux (Maven) >= 4.2.0, < 4.2.5, fixed in 4.2.5 ; org.springframework.cloud:spring-cloud-gateway-server-webflux (Maven) >= 4.3.0, < 4.3.1, fixed in 4.3.1 . Check your lockfile, including transitive dependencies.

## What it is

Spring Cloud Gateway Server Webflux may be vulnerable to Spring Environment property modification. An application should be considered vulnerable when all the following are true: The application is using Spring Cloud Gateway Server Webflux (Spring Cloud Gateway Server WebMVC is not vulnerable). Spring Boot actuator is a dependency. The Spring Cloud Gateway Server Webflux actuator web endpoint is enabled via management.endpoints.web.exposure.include=gateway. The actuator endpoints are available to attackers. The actuator endpoints are unsecured.

## Affected packages

- Maven `org.springframework.cloud:spring-cloud-gateway-server-webflux` >= 3.1.0, <= 3.1.10 → fixed: none listed
- Maven `org.springframework.cloud:spring-cloud-gateway-server-webflux` >= 4.0.0, <= 4.1.10 → fixed: none listed
- Maven `org.springframework.cloud:spring-cloud-gateway-server-webflux` >= 4.2.0, < 4.2.5 → fixed: 4.2.5
- Maven `org.springframework.cloud:spring-cloud-gateway-server-webflux` >= 4.3.0, < 4.3.1 → fixed: 4.3.1

## Affected products (CVE record)

- Spring Cloud Gateway: 4.3.x < 4.3.1, 4.2.x < 4.2.5, 4.1.x, 4.0.x < 4.1.11, 3.1.x < 3.1.11

## Severity

- vmware CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 3.55% probability of exploitation activity in the next 30 days; percentile 89.

## Sources

- [GitHub Advisory GHSA-q2cj-h8fw-q4cc](https://github.com/advisories/GHSA-q2cj-h8fw-q4cc)
- [CVE.org record CVE-2025-41243](https://www.cve.org/CVERecord?id=CVE-2025-41243)
- [NVD entry CVE-2025-41243](https://nvd.nist.gov/vuln/detail/CVE-2025-41243)
- [spring.io](https://spring.io/security/cve-2025-41243)

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Source page: https://erroneo.us/security/cve/CVE-2025-41243/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt