# CVE-2026-112039: diem-project diem Administrative Console actions.class.php append cross site scripting

> Remote attackers can execute arbitrary scripts via the dm_command argument in the diem Administrative Console, potentially compromising user sessions.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** GHSA-4g4g-ph7c-qhh4

## What is CVE-2026-112039?

CVE-2026-112039 is a medium-severity cross-site scripting vulnerability in diem-project diem, published on 19 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in diem-project diem up to 116974edfb9a5b8bd69cb13586dc62bcdbb485ad. Affected by this issue is the function append of the file dmAdminPlugin/modules/dmConsole/actions/actions.class.php of the component Administrative Console. The manipulation of the argument dm_command results in cross site scripting. The attack can be executed remotely. The exploit has been made public and could be used. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-112039?


## How do I fix CVE-2026-112039?

No fix has been published for CVE-2026-112039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-112039 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112039 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-112039 and fix it if it is affected.

What it is: CVE-2026-112039 is a medium-severity cross-site scripting vulnerability in diem-project diem, published on 19 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112039 exists.

Affected product: diem-project diem. 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-2026-112039/ (Markdown: https://insights.sbomify.com/CVE-2026-112039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-112039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112039
- OSV: https://osv.dev/vulnerability/CVE-2026-112039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-112039/
Summaries are generated and may contain mistakes; the official description above is the record.