CVE-2021-41868 Remote unauthenticated attackers able to upload files in Onionshare

What is CVE-2021-41868?

CVE-2021-41868 is a critical vulnerability in n/a, published on 4 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to upload files on a non-public node when using the --receive functionality.

Which versions are affected by CVE-2021-41868?

3 open source packages ship an affected version, including onionshare-cli. It affects 1 product.

Products include Onionshare Onionshare.

How do I fix CVE-2021-41868?

Upgrade onionshare-cli to 2.4 or later.

Is CVE-2021-41868 being exploited?

There is no known exploitation of CVE-2021-41868 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2022-21690 Cross-Site Scripting in Onionshare High 8.7
• CVE-2022-21688 Out-of-bounds Read in Onionshare High 7.5
• CVE-2022-21689 Denial of Service in Onionshare High 7.5
• CVE-2018-19960 Path traversal in n/a High 7.0
• CVE-2022-21693 Path traversal in Onionshare Medium 6.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-41868, GHSA-7g47-xxff-9p85, PYSEC-2026-434, UBUNTU-CVE-2021-41868.