# CVE-2026-12071: TeamDavid: Header Injection leading to Open Redirect via URL-encoded characters

> Attackers can redirect users to malicious domains or inject headers via URL-encoded characters in TeamDavid Webbox redirects.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:** 7 Aug 2026
- **Updated:** 7 Sep 2026
- **Also known as:** GHSA-jrwc-g36x-gqc7

## What is CVE-2026-12071?

CVE-2026-12071 is a medium-severity vulnerability in Tobit Laboratories AG TeamDavid, published on 7 Aug 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

The Webbox of TeamDavid by Tobit Laboratories AG constructs redirect URLs using user-supplied input, 
which is appended to the redirect target in a 302 HTTP response. By 
using URL-encoded characters such as “%2e” (representing a dot), an 
attacker can manipulate the portion of the URL following the top-level 
domain (TLD). If a similar, registerable TLD exists (for example, if 
“.com” is the application’s domain, and “.company” is available for 
registration), an attacker can craft a URL to redirect users to a 
malicious “.company” domain. By using URL-encoded line feeds, it becomes
 possible to insert arbitrary response headers in the server's HTTP 
response.

This issue affects TeamDavid before Rollout 528.

Starting with Rollout 528 (June 30, 2026), the affected functionality is disabled by default and the vulnerabilities are therefore no longer exposed through this functionality.

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

## Which versions are affected by CVE-2026-12071?


## How do I fix CVE-2026-12071?

No fix has been published for CVE-2026-12071 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12071 being exploited?

There is no known exploitation of CVE-2026-12071 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12071 and fix it if it is affected.

What it is: CVE-2026-12071 is a medium-severity vulnerability in Tobit Laboratories AG TeamDavid, published on 7 Aug 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-2026-12071 in the wild and no public exploit code.

Affected product: Tobit Laboratories AG TeamDavid. 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-2026-12071/ (Markdown: https://insights.sbomify.com/CVE-2026-12071/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12071
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12071
- OSV: https://osv.dev/vulnerability/CVE-2026-12071

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12071/
Summaries are generated and may contain mistakes; the official description above is the record.