CVE-2026-54208
TeamDavid: Arbitrary File Write leading to Stored XSS
- State
- Published
- Severity
- 8.5 High
- Published
- Aug 7, 2026
- Updated
- Sep 7, 2026
- Reserved
- Jun 12, 2026
Description
Tobit Laboratories AG TeamDavid's Webbox application is vulnerable to arbitrary file write, allowing an unauthenticated attacker to create or write into existing files on the server with attacker-controlled content. This is possible because user input is written directly to files without proper validation or restriction on file types. As a result, an attacker can create files (e.g., .htm), containing malicious JavaScript code. When a user accesses a file created in this way, stored cross-site scripting is triggered. 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.5 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L | NCSC.ch |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
TeamDavidTobit Laboratories AG |
|
References
- https://chayns.net/77892-10814/tapp/763210?postId=11454release-notes
- https://labs.infoguard.ch/posts/22-cves-in-david-a-secure-m365-alternative/third-party-advisory
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