# CVE-2026-53988: Dockhand < 1.0.40 Unauthenticated Webhook Trigger via Git Webhook Endpoints

> Unauthenticated attackers can trigger arbitrary stack redeployments in Dockhand, potentially leading to denial of service or host compromise via malicious git branches.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Sep 2026
- **Updated:** 2 Oct 2026
- **Also known as:** GHSA-h855-x6jx-cfw2

## What is CVE-2026-53988?

CVE-2026-53988 is a critical authentication bypass vulnerability in Finsys dockhand, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Dockhand before 1.0.40 contains an authentication bypass vulnerability in its git webhook endpoints that allows unauthenticated remote attackers to trigger arbitrary stack redeployments by exploiting a null webhook secret guard condition. Attackers can enumerate sequential stack IDs and send unsigned webhook requests to force git clone and docker compose operations, enabling denial of service or, when combined with write access to the tracked git branch, container escape and full host compromise via attacker-controlled docker-compose.yml with privileged bind mounts.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-53988?


## How do I fix CVE-2026-53988?

No fix has been published for CVE-2026-53988 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-53988 being exploited?

There is no known exploitation of CVE-2026-53988 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53988 and fix it if it is affected.

What it is: CVE-2026-53988 is a critical authentication bypass vulnerability in Finsys dockhand, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-53988 in the wild and no public exploit code.

Affected product: Finsys dockhand. 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-2026-53988/ (Markdown: https://insights.sbomify.com/CVE-2026-53988/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53988
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53988
- OSV: https://osv.dev/vulnerability/CVE-2026-53988

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53988/
Summaries are generated and may contain mistakes; the official description above is the record.