---
id: "CVE-2026-115289"
kind: "vulnerability"
aliases: ["CVE-2026-115289"]
title: "Elastic APM Server: crafted agent config request leaks another service's settings"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apm-server", "elastic-stack", "infrastructure", "observability"]
not_affected_if: ["central-agent-config-unused"]
published_at: "2026-11-03T17:17:54+00:00"
first_seen_at: "2026-11-03T17:21:54+00:00"
updated_at: "2026-11-03T17:24:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115289", "first_seen_at": "2026-11-03T17:21:54+00:00"}]
---

# Elastic APM Server: crafted agent config request leaks another service's settings

APM Server, Elastic's application performance monitoring server, can be made to hand an authenticated agent the central configuration that belongs to a different service, until the cache expires. A service can then run with sampling settings meant for another service, which is an information disclosure and a configuration mix-up.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Find the APM Server version with `apm-server version` or the `version` field on its root endpoint, and compare it against the fixed release in the product ranges.
- Check whether central agent configuration is in use in Kibana under APM > Settings > Agent Configuration.

## Timeline

- 2026-11-03T17:21:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115289

## From the sources

Use of Multiple Resources with Duplicate Identifier (CWE-694) in APM Server can lead to information disclosure via a specially crafted agent configuration request. An authenticated APM agent could receive the central agent configuration that belongs to a different service until the cached configuration expires. A service could also run with central configuration settings, such as sampling settings, that were meant for a different service.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_