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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].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11839 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11839

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11839 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11839

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.