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CVE-2026-54707— OnionShare Receive mode writes uploaded files even when file uploads are disabled

Quick assessment

Affected
onionshare onionshare
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OnionShare是onionshare个人开发者开源的一种文件传输工具。 OnionShare 2.6.4之前版本存在授权问题漏洞，该漏洞源于未强制执行cli/onionshare_cli/web/receive_mode.py中的Receive mode disable_files设置，导致即使设置为仅文本仍将multipart文件数据写入磁盘，可能允许攻击者上传文件。

CVSS 5.4 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
onionshare onionshare < 2.6.4 affected
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I. Basic Information for CVE-2026-54707

Vulnerability Information
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Vulnerability Title
OnionShare Receive mode writes uploaded files even when file uploads are disabled
Source: CVE Program / CVE List V5
Vulnerability Description
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 does not enforce the Receive mode disable_files setting in cli/onionshare_cli/web/receive_mode.py, where ReceiveModeRequest._get_file_stream() writes multipart file[] data to disk despite the text-only setting. This issue is fixed in version 2.6.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OnionShare 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OnionShare是onionshare个人开发者开源的一种文件传输工具。 OnionShare 2.6.4之前版本存在授权问题漏洞，该漏洞源于未强制执行cli/onionshare_cli/web/receive_mode.py中的Receive mode disable_files设置，导致即使设置为仅文本仍将multipart文件数据写入磁盘，可能允许攻击者上传文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
onionshare onionshare < 2.6.4 -

II. Public POCs for CVE-2026-54707

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III. Intelligence Information for CVE-2026-54707

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Patches & Fixes for CVE-2026-54707 (1)

Vendor Advisories for CVE-2026-54707 (1)

Vendor Pages for CVE-2026-54707 (1)

IV. Related Vulnerabilities

Same product: onionshare
Same vendor: onionshare
Same weakness: CWE-863

V. Comments for CVE-2026-54707

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