CVE-2022-21695: Improper Access Control in Onionshare

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-18 · updated 2026-06-17
Weakness: CWE-287

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. In affected versions authenticated users (or unauthenticated in public mode) can send messages without being visible in the list of chat participants. This issue has been resolved in version 2.5.

Affected products

onionshare: before 2.5 — fixed in 2.5

How to fix

Upgrade to a fixed version: onionshare 2.5. Check the vendor advisory for mitigations.

References

https://github.com/onionshare/onionshare/releases/tag/v2.5
https://github.com/onionshare/onionshare/security/advisories/GHSA-99p8-9p2c-49j4
https://github.com/onionshare/onionshare/releases/tag/v2.5
https://github.com/onionshare/onionshare/security/advisories/GHSA-99p8-9p2c-49j4

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