CVE-2026-11839Network attack vector

Authenticated code execution via dangerous file upload

Published Jun 11, 2026 · Updated Jun 11, 2026

Unrestricted file upload in Başarsoft Rotaban 2026.06.002 allows remote authenticated users to execute code via a web shell. The affected upload function stores a server-executable file on the web server, but no endpoint or finer-grained locus is public. Low-privileged authentication is required; the public record does not identify the accepted extension or server execution context.

CVSS severity9.9
Critical
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Başarsoft Rotaban 2026.06.002 allows remote authenticated users to execute code via a web shell. The affected upload function stores a server-executable file on the web server, but no endpoint or finer-grained locus is public. Low-privileged authentication is required; the public record does not identify the accepted extension or server execution context.

The record

CVE
CVE-2026-11839
Published
Jun 11, 2026
Updated
Jun 11, 2026
Vendor
Başarsoft Information Technologies Inc.
Product
Rotaban
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=V2026.06.002 <V2026.06.003

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Başarsoft Information Technologies Inc. · Rotabanversion=V2026.06.002 <V2026.06.003

Published CVSS scores

9.9Computer Emergency Response Team of the Republic of TurkeyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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