# CVE-2026-57304: Jenkins Assembla Plugin has a missing permission check

> Attackers with read access can connect to arbitrary URLs using specified credentials due to missing permission checks in the Jenkins Assembla Plugin.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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:** 24 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-2r5w-jh6g-8hff

## What is CVE-2026-57304?

CVE-2026-57304 is a medium-severity missing authorization vulnerability in Jenkins Assembla Plugin, published on 24 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A missing permission check in Jenkins Assembla Plugin 1.4 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using an attacker-specified username and password.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-57304?

2 open source packages ship an affected version, including org.jenkins-ci.plugins:assembla. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.jenkins-ci.plugins:assembla` | Maven | All versions to 1.4 | None |
| `org.jenkins-ci.plugins:assembla` | Maven | All versions to 1.4 | None |

Products: Jenkins Assembla.

## How do I fix CVE-2026-57304?

No fix has been published for CVE-2026-57304 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57304 being exploited?

There is no known exploitation of CVE-2026-57304 in the wild and no public exploit code.

## Other vulnerabilities in Jenkins Assembla Plugin

- [CVE-2023-37961](https://insights.sbomify.com/CVE-2023-37961/): Jenkins Assembla Auth Plugin vulnerable to cross-site request forgery (high 8.8)
- [CVE-2026-57303](https://insights.sbomify.com/CVE-2026-57303/): Jenkins Assembla Plugin has an XXE vulnerability (high 7.1)
- [CVE-2019-10420](https://insights.sbomify.com/CVE-2019-10420/): Jenkins Assembla Plugin has Insufficiently Protected Credentials (medium 5.5)
- [CVE-2026-57305](https://insights.sbomify.com/CVE-2026-57305/): Jenkins Assembla Plugin has a cross-site request forgery (CSRF) vulnerability (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57304 and fix it if it is affected.

What it is: CVE-2026-57304 is a medium-severity missing authorization vulnerability in Jenkins Assembla Plugin, published on 24 Jun 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-2026-57304 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.jenkins-ci.plugins:assembla (Maven): affected all versions up to 1.4; no fix listed
- org.jenkins-ci.plugins:assembla (Maven): affected all versions up to 1.4; no fix listed

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-2026-57304/ (Markdown: https://insights.sbomify.com/CVE-2026-57304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57304
- OSV: https://osv.dev/vulnerability/CVE-2026-57304

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57304/
Summaries are generated and may contain mistakes; the official description above is the record.