# CVE-2026-25856: OpenBullet2 0.3.2 Authenticated RCE via Job Configuration Interface

> Authenticated attackers can execute arbitrary C# code on the server via job configurations, leading to full system compromise.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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 Jun 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-w8vj-qcv3-4w36

## What is CVE-2026-25856?

CVE-2026-25856 is a high-severity code injection vulnerability in openbullet2, published on 8 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenBullet2 through version 0.3.2 contains an authenticated remote code execution vulnerability that allows authenticated users to execute arbitrary C# code on the server host by creating or modifying job configurations. Attackers can leverage the plain C# execution mode, which lacks reference filtering or API restrictions, to access the file system, spawn processes, and invoke arbitrary .NET APIs as the process user.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-25856?


## How do I fix CVE-2026-25856?

No fix has been published for CVE-2026-25856 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-25856 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25856 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25856 and fix it if it is affected.

What it is: CVE-2026-25856 is a high-severity code injection vulnerability in openbullet2, published on 8 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25856 exists.

Affected product: openbullet2. 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-2026-25856/ (Markdown: https://insights.sbomify.com/CVE-2026-25856/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25856
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25856
- OSV: https://osv.dev/vulnerability/CVE-2026-25856

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-25856/
Summaries are generated and may contain mistakes; the official description above is the record.