# CVE-2026-66084: Apache DolphinScheduler: Project Authorization Bypass in the Task Definition with-upstream Endpoint

> Authenticated users can modify task definitions in unauthorized projects by bypassing project access checks, compromising workflow integrity.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/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:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-26vh-p5jc-q2mg

## What is CVE-2026-66084?

CVE-2026-66084 is a high-severity missing authorization vulnerability in Apache DolphinScheduler, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An authorization bypass vulnerability in Apache DolphinScheduler allows authenticated users to modify task definitions in projects they are not authorized to access through the /dolphinscheduler/projects/{projectCode}/task-definition/{code}/with-upstream endpoint.

The endpoint fails to verify that the task definition identified by code belongs to the project specified by projectCode. An authenticated user can supply the code of a project they are authorized to access together with a task definition code from another project, bypassing project access restrictions and modifying the target task definition and its upstream dependencies.

This vulnerability can compromise workflow integrity and disrupt task execution in unauthorized projects.This issue affects Apache DolphinScheduler: before 3.4.3.

Users are recommended to upgrade to version 3.4.3, which fixes the issue.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-66084?


## How do I fix CVE-2026-66084?

No fix has been published for CVE-2026-66084 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66084 being exploited?

There is no known exploitation of CVE-2026-66084 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66084 and fix it if it is affected.

What it is: CVE-2026-66084 is a high-severity missing authorization vulnerability in Apache DolphinScheduler, published on 8 Oct 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-2026-66084 in the wild and no public exploit code.

Affected product: Apache DolphinScheduler. 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-2026-66084/ (Markdown: https://insights.sbomify.com/CVE-2026-66084/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66084
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66084
- OSV: https://osv.dev/vulnerability/CVE-2026-66084

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66084/
Summaries are generated and may contain mistakes; the official description above is the record.