Read the docs
TI-2026-39523 Aliases CVE-2026-54707GHSA-v833-3823-cmhp

OnionShare Receive mode writes uploaded files even when file uploads are disabled

Priority MEDIUM 58CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.004 34th percentileScored 2026-11-07
Fix Fixed onionshare (onionshare): 2.6.4onionshare-cli (PyPI): 2.6.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
onionshareonionsharebefore 2.6.42.6.4Patch availableCNA
—onionshare-cli (PyPI)before 2.6.42.6.4Patch availableGHSA-v833-3823-cmhp
  • onionshare Vendoronionshare Affected before 2.6.4 Fixed in 2.6.4 Patch available CNA
  • onionshare-cli (PyPI) Vendor— Affected before 2.6.4 Fixed in 2.6.4 Patch available GHSA-v833-3823-cmhp

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:onionshare:onionshare:*:*:*:*:*:*:*:*——onionshare
  • cpe:2.3:a:onionshare:onionshare:*:*:*:*:*:*:*:* Versions — — ·onionshare

Remediation

  • Fix · CNA onionshare (onionshare) Fixed in 2.6.4
  • Fix · GHSA-v833-3823-cmhp onionshare-cli (PyPI) Fixed in 2.6.4 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54707
  2. 2026-10-03 Alias added: GHSA-v833-3823-cmhp

References

Other 4

  • TI-2022-06066 Cross-Site Scripting in Onionshare CVSS 3.1HIGH 8.7
  • TI-2026-39522 OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files CVSS 3.1MEDIUM 4.8
  • TI-2022-06068 Improper Access Control in Onionshare CVSS 3.1MEDIUM 4.3
  • TI-2021-18479 OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to upload files on a… CVSS 3.1CRITICAL 9.8
  • TI-2022-06065 Denial of Service in Onionshare CVSS 3.1HIGH 7.5
  • TI-2022-06064 Out-of-bounds Read in Onionshare CVSS 3.1HIGH 7.5
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences