Vulnerability · Published Aug 7, 2026 · Assigned by NCSC.ch

CVE-2026-54213TeamDavid: Denial of Service via endpoint 'internalRestart'

Critical 9.2

In plain English

A critical-severity improper access control in TeamDavid from Tobit Laboratories AG. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).

Severity (CVSS 4.0)9.2Critical

Exploit odds (30 days)0.7%top 46.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Tobit Laboratories AG TeamDavid's Webbox application exposes a functionality that allows the server to be shut down when a specific endpoint (/internalRestart) is accessed. This endpoint is accessible to unauthenticated users over the public Internet. Instead of “restarting”, the server shuts completely down. As a result, a remote attacker can trigger a persistent denial of service by shutting down the web server without requiring authentication. Recovery requires manual administrator intervention to restart the service. 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-284 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

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