OnionShare up to 2.6.3 Send Base Mode send_base_mode.py information disclosure

Summaryinfo

A vulnerability identified as problematic has been detected in OnionShare up to 2.6.3. This affects the function SendBaseModeWeb.set_file_info/stream_individual_file of the file cli/onionshare_cli/web/send_base_mode.py of the component Send Base Mode. Performing a manipulation results in information disclosure. This vulnerability is reported as CVE-2026-54706. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in OnionShare up to 2.6.3. It has been classified as problematic. This affects the function SendBaseModeWeb.set_file_info/stream_individual_file of the file cli/onionshare_cli/web/send_base_mode.py of the component Send Base Mode. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. Prior to 2.6.4, OnionShare CLI/Desktop follows symbolic links in cli/onionshare_cli/web/send_base_mode.py through SendBaseModeWeb.set_file_info() and stream_individual_file(), allowing remote recipients of Share or Website mode to read local files outside the selected directory. This issue is fixed in version 2.6.4.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-54706 since 06/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 2.6.4 eliminates this vulnerability.

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Productinfo

Name

• OnionShare

Version

• 2.6.0
• 2.6.1
• 2.6.2
• 2.6.3

Website

• Product: https://github.com/onionshare/onionshare/

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