# CVE-2026-84115: Cleo Harmony JWT Refresh Token connections privileges management

> Remote attackers can escalate privileges by manipulating JWT refresh tokens in Cleo Harmony, requiring an upgrade to remediate.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Sep 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-jg45-wrwh-x4rp

## What is CVE-2026-84115?

CVE-2026-84115 is a medium-severity vulnerability in Cleo Harmony, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in Cleo Harmony up to 5.8.1.10. The affected element is an unknown function of the file /api/connections of the component JWT Refresh Token Handler. Performing a manipulation of the argument Bearer results in improper privilege management. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 5.8.1.11 is sufficient to fix this issue. It is recommended to upgrade the affected component.

Weakness: CWE-269 (Improper Privilege Management), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-84115?


## How do I fix CVE-2026-84115?

No fix has been published for CVE-2026-84115 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-84115 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84115 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84115 and fix it if it is affected.

What it is: CVE-2026-84115 is a medium-severity vulnerability in Cleo Harmony, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84115 exists.

Affected product: Cleo Harmony. 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-2026-84115/ (Markdown: https://insights.sbomify.com/CVE-2026-84115/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84115
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84115
- OSV: https://osv.dev/vulnerability/CVE-2026-84115

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-84115/
Summaries are generated and may contain mistakes; the official description above is the record.