CVE-2026-11839 Arbitrary File Upload in Basarsoft's Rotaban

Critical 9.9 Published 11 Jun 2026 Updated 17 Jun 2026

Attackers can upload malicious web shells to the Rotaban web application, leading to remote code execution on the server.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-11839?

CVE-2026-11839 is a critical vulnerability in Başarsoft Information Technologies Inc. Rotaban, published on 11 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Unrestricted upload of file with dangerous type vulnerability in Başarsoft Information Technologies Inc. Rotaban allows Upload a Web Shell to a Web Server.

This issue affects Rotaban: from V2026.06.002 before V2026.06.003.

Weakness: CWE-434

Which versions are affected by CVE-2026-11839?

How do I fix CVE-2026-11839?

No fix has been published for CVE-2026-11839 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-11839 being exploited?

There is no known exploitation of CVE-2026-11839 in the wild and no public exploit code.

Sources

Also known as GHSA-4r5w-3xv4-56jm.