It was discovered that OnionShare could be exploited when run with the --debug argument. A local attacker could possibly use this issue to access sensitive information. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19960)
It was discovered that OnionShare could be blocked from uploading files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-21689)