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Critical

Unrestricted File Upload in Başarsoft Rotaban

IdentifiersCVE-2026-11839CWE-434· Unrestricted Upload of File with…

CVE-2026-11839 is an unrestricted upload of file with dangerous type vulnerability in Başarsoft Information Technologies Inc. Rotaban. The issue affects Rotaban versions from V2026.06.002 before V2026.06.003. According to the provided content, successful exploitation allows an attacker to upload a web shell to the web server hosting the application. This indicates insufficient validation or restriction of uploaded file types within the application's file upload functionality, enabling dangerous server-executable content to be placed on the server.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can allow an attacker to upload a web shell to the affected web server and potentially execute arbitrary server-side commands. This can result in remote code execution in the context of the web application, leading to compromise of confidentiality, integrity, and availability of the affected server. The provided CVSS vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H) further indicates high impact across all three security objectives and that low privileges are required.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, restrict or disable file upload functionality where feasible; enforce strict server-side allowlisting of permitted file types and extensions; prevent uploaded content from being stored in web-accessible or executable directories; configure the web server to disallow execution of uploaded files; and monitor for unexpected uploaded scripts or web shell artifacts. These mitigations are general best practices inferred from the vulnerability type; the provided content does not include vendor-specific mitigation guidance.

Remediation

Patch, then assume compromise.

Upgrade Başarsoft Rotaban to V2026.06.003 or later, as the issue affects versions from V2026.06.002 before V2026.06.003.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6

Community discussion across Reddit, Mastodon, and other social sources.