Improper Access Control in Onionshare

published 2022-01-18 4 y ago modified 2026-06-17 4 mo ago also GHSA-w9m4-7w72-r766 , PYSEC-2022-42 , EUVD-2022-0182

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

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 chat participants can spoof their channel leave message, tricking others into assuming they left the chatroom.

Patch / fix

fixed in 2 distros 2 links 1

pypi onionshare-cli 2.5
onionshare onionshare 2.5

debian opensuse

onionshare Debian 14, Debian 13, Debian 12 2.5-1

debian advisories DEBIAN-CVE-2022-21691

python-onionshare openSUSE Tumbleweed 2.5-1.1
python3-onionshare openSUSE Tumbleweed 2.6-4.1

opensuse advisories openSUSE-SU-2024:11983-1 openSUSE-SU-2024:13635-1

github.com/onionshare/onionshare/releases/tag/v2.5 release

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-21691 updated 2025-11-21 cvss 4.3

onionshare: Missing Authentication for Critical Function

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-23)

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:N/I:P/A:N
GitHub	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	onionshare-cli	>=2.3, <2.5 <2.5	2.5

Affected products

onionshare onionshare

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality

References

github.com /onionshare/onionshare/releases/tag/v2.5
web, release-notes, third-party-advisory
github.com /onionshare/onionshare/security/advisories/GHSA-w9m4-7w72-r766
web, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2022-21691
advisory
github.com /onionshare/onionshare
package
github.com /pypa/advisory-database/tree/main/vulns/onionshare-cli/PYSEC-2022-42.yaml
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary