# CVE-2026-78103: Dimension Log Server Configuration Lock Bypass Vulnerability

> Authenticated administrators can bypass client-side locks to overwrite concurrent configuration changes in WatchGuard Dimension.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Aug 2026
- **Updated:** 28 Aug 2026
- **Also known as:** GHSA-6c67-gmx4-f33h

## What is CVE-2026-78103?

CVE-2026-78103 is a medium-severity vulnerability in WatchGuard Dimension, published on 27 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

WatchGuard Dimension provides a client-side lock/unlock UI control for management changes. The server-side configuration endpoint does not enforce this lock/unlock workflow state, allowing an authenticated administrator to submit configuration changes directly to the endpoint without first completing the UI unlock step. This allows an authenticated read-write administrator session to bypass the intended editing workflow and overwrite configuration changes being made by another concurrent administrator session.

Weakness: CWE-841 (Improper Enforcement of Behavioral Workflow)

## Which versions are affected by CVE-2026-78103?


## How do I fix CVE-2026-78103?

No fix has been published for CVE-2026-78103 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-78103 being exploited?

There is no known exploitation of CVE-2026-78103 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78103 and fix it if it is affected.

What it is: CVE-2026-78103 is a medium-severity vulnerability in WatchGuard Dimension, published on 27 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-78103 in the wild and no public exploit code.

Affected product: WatchGuard Dimension. 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-2026-78103/ (Markdown: https://insights.sbomify.com/CVE-2026-78103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78103
- OSV: https://osv.dev/vulnerability/CVE-2026-78103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78103/
Summaries are generated and may contain mistakes; the official description above is the record.