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CVE-2026-54706— OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files

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之前版本存在后置链接漏洞，该漏洞源于在cli/onionshare_cli/web/send_base_mode.py中通过SendBaseModeWeb.set_file_info()和stream_individual_file()函数处理符号链接，可能导致远程Share或Website模式接收者读取选定目录之外的本地文件。

CVSS 4.8 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
onionshare onionshare < 2.6.4 affected
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I. Basic Information for CVE-2026-54706

Vulnerability Information
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Vulnerability Title
OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files
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 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
OnionShare 后置链接漏洞
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之前版本存在后置链接漏洞，该漏洞源于在cli/onionshare_cli/web/send_base_mode.py中通过SendBaseModeWeb.set_file_info()和stream_individual_file()函数处理符号链接，可能导致远程Share或Website模式接收者读取选定目录之外的本地文件。
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-2026-54706

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III. Intelligence Information for CVE-2026-54706

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Patches & Fixes for CVE-2026-54706 (1)

Vendor Advisories for CVE-2026-54706 (1)

Vendor Pages for CVE-2026-54706 (1)

IV. Related Vulnerabilities

Same product: onionshare
Same vendor: onionshare
Same weakness: CWE-59

V. Comments for CVE-2026-54706

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