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CVE-2026-54706 medium CVSS 4.8

Vulnerability in onionshare-cli (CVE-2026-54706)

Summary

Vulnerability in onionshare-cli (CVE-2026-54706). Confidential information can be exposed externally. Exploitable via onionshare_cli.web. Mitigation: upgrade to 2.6.4 or later.

Original description

The description as published by the source.

Summary

OnionShare CLI/Desktop 2.6.3 can follow symbolic links inside a selected Share or Website directory and serve the symlink target rather than limiting access to files physically contained in the selected directory. If a user shares a directory that contains attacker-supplied or otherwise untrusted symlinks, a remote recipient with access to the OnionShare service can read arbitrary local files readable by the OnionShare process that the symlink points to.

This affects the shipped onionshare-cli Python package and the desktop application because both call the same onionshare_cli.web file-indexing and streaming code.

Details

Tested repository: https://github.com/onionshare/onionshare at commit 8cc75e1d7e88bd31f7276733449d412bf71c8999.

Affected product evidence:

  • cli/pyproject.toml declares onionshare_cli version 2.6.3.
  • desktop/pyproject.toml declares onionshare version 2.6.3 and depends on onionshare_cli from ../cli.
  • cli/setup.py publishes onionshare-cli and includes onionshare_cli.web plus templates/static resources.
  • desktop/setup.py publishes onionshare and exposes both onionshare and onionshare-cli console scripts.

Reachable default/common paths:

  • CLI share mode is the default mode when no --receive, --website, or --chat flag is provided (cli/onionshare_cli/__init__.py:234-241) and accepts filesystem paths from CLI arguments (cli/onionshare_cli/__init__.py:184-189).
  • CLI website mode is exposed throu…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-54706 has been found in onionshare-cli.
Attackers can target a specific entry point like onionshare_cli.web over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 4.8/10.
What to do: upgrade onionshare-cli to 2.6.4 or later.
If unsure, ask your IT team or search "onionshare-cli CVE-2026-54706" on the vendor's site.

CVE-2026-54706 (onionshare-cli) — CWE-59 / CVSS v3 4.8
Attack vector: remote (network-reachable)
Attack surface: onionshare_cli.web / onionshare_cli / onionshare / waitress
Patched: 2.6.4 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-59) exists in onionshare-cli. Attackers reach the vulnerable code path via onionshare_cli.web.

📍 Affected scope

Check the vendor advisory for the affected versions of onionshare-cli. Attack surface: onionshare_cli.web / onionshare_cli / onionshare / waitress.

🔥 Severity

Severity: Medium (CVSS 4.8/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 2.6.4.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'onionshare-cli' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'onionshare-cli' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で onionshare-cli を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade onionshare-cli to 2.6.4

    ステージング環境で 2.6.4 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip onionshare-cli
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.4"}]}]
PyPI onionshare-cli
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.4"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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