# CVE-2026-4818: Some management operations on data streams are not properly restricted when user does not have the necessary privileges

> Users lacking necessary privileges can execute management operations on data streams, potentially leading to unauthorized data modification or privilege escalation.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Mar 2026
- **Updated:** 31 Mar 2026
- **Also known as:** GHSA-73g6-24f6-wqv9

## What is CVE-2026-4818?

CVE-2026-4818 is a medium-severity missing authorization vulnerability in floragunn Search Guard FLX, published on 31 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Search Guard FLX versions from 3.0.0 up to 4.0.1, there exists an issue which allows users without the necessary privileges to execute some management operations against data streams.

Weakness: CWE-862 (Missing Authorization), CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-4818?

It affects 1 product.


Products: Search-Guard Flx.

## How do I fix CVE-2026-4818?

No fix has been published for CVE-2026-4818 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4818 being exploited?

There is no known exploitation of CVE-2026-4818 in the wild and no public exploit code.

## Other vulnerabilities in floragunn Search Guard FLX

- [CVE-2026-4819](https://insights.sbomify.com/CVE-2026-4819/): Search Guard audit logs can contain under certain conditions user credentials (medium 4.9)
- [CVE-2026-4799](https://insights.sbomify.com/CVE-2026-4799/): Open redirect vulnerability in Search Guard Kibana Plugin via manipulated requests (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4818 and fix it if it is affected.

What it is: CVE-2026-4818 is a medium-severity missing authorization vulnerability in floragunn Search Guard FLX, published on 31 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4818 in the wild and no public exploit code.

Affected product: floragunn Search Guard FLX. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4818/ (Markdown: https://insights.sbomify.com/CVE-2026-4818/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4818
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4818
- OSV: https://osv.dev/vulnerability/CVE-2026-4818

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4818/
Summaries are generated and may contain mistakes; the official description above is the record.