PatchSiren cyber security CVE debrief

CVE-2026-11839 Başarsoft Information Technologies Inc. CVE debrief

CVE-2026-11839 is a critical vulnerability in Rotaban, a product by Başarsoft Information Technologies Inc. The issue, which has a CVSS score of 9.9, allows for the unrestricted upload of files with dangerous types. This could enable an attacker to upload a web shell to a web server. The vulnerability affects Rotaban versions from V2026.06.002 up to but not including V2026.06.003. It is essential for users of the affected versions to update to V2026.06.003 or later to mitigate this vulnerability.

Vendor: Başarsoft Information Technologies Inc.
Product: Rotaban
CVSS: CRITICAL 9.9
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-11
Original CVE updated: 2026-06-11
Advisory published: 2026-06-11
Advisory updated: 2026-06-11

Who should care

Administrators and users of Rotaban versions V2026.06.002 and earlier should be aware of this vulnerability and take immediate action to update their systems.

Technical summary

The vulnerability is caused by an unrestricted upload of file with dangerous type in Rotaban. This could allow an attacker to upload malicious files, including web shells, to the server.

Defensive priority

High

Recommended defensive actions

Update Rotaban to version V2026.06.003 or later.
Review server logs for suspicious file uploads.
Implement additional security measures to monitor and restrict file uploads.

Evidence notes

The CVE record and NVD detail provide official information about the vulnerability. [See resourceLinkAnnotations for source links].

Official resources

CVE-2026-11839 was published on 2026-06-11T16:16:22.497Z and modified on 2026-06-11T20:52:02.393Z.