Vulnerability · Published Aug 7, 2026 · Assigned by NCSC.ch
CVE-2026-12071TeamDavid: Header Injection leading to Open Redirect via URL-encoded characters
Medium 5.3
In plain English
A medium-severity open redirect in TeamDavid from Tobit Laboratories AG. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tobit Laboratories AG | TeamDavid | 0 – before Rollout 528 |
Weakness: CWE-601 · 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
References
- https://chayns.net/77892-10814/tapp/763210?postId=11454 release-notes
- https://labs.infoguard.ch/posts/22-cves-in-david-a-secure-m365-alternative/ third-party-advisory