# CVE-2026-53989: Dockhand < 1.0.36 Open Redirect via OIDC Initiation Endpoint

> Unauthenticated attackers can redirect users to malicious sites via OIDC endpoints, enabling credential phishing and authorization code theft.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 Sep 2026
- **Updated:** 29 Sep 2026
- **Also known as:** GHSA-35hf-9v83-m378

## What is CVE-2026-53989?

CVE-2026-53989 is a medium-severity vulnerability in Finsys dockhand, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Dockhand before 1.0.36 contains an open redirect vulnerability in the OIDC initiation endpoint that allows unauthenticated remote attackers to redirect authenticated users to attacker-controlled sites by injecting an unvalidated redirect query parameter. Attackers can craft a malicious link targeting the OIDC callback flow to capture authorization codes via the Referer header and conduct follow-up credential phishing against any Dockhand account after a legitimate login.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2026-53989?


## How do I fix CVE-2026-53989?

No fix has been published for CVE-2026-53989 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-53989 being exploited?

There is no known exploitation of CVE-2026-53989 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53989 and fix it if it is affected.

What it is: CVE-2026-53989 is a medium-severity vulnerability in Finsys dockhand, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-53989 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-2026-53989/ (Markdown: https://insights.sbomify.com/CVE-2026-53989/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53989
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53989
- OSV: https://osv.dev/vulnerability/CVE-2026-53989

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53989/
Summaries are generated and may contain mistakes; the official description above is the record.