Ubuntu Security Notices USN-8404-1 USN-8404-1: Transmission vulnerability Publication date 8 June 2026 Overview Transmission could allow unintended actions if a user visited a malicious website. Releases 26.04 LTS 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages transmission - lightweight BitTorrent client Details It was discovered that Transmission had a clickjacking weakness in the browser-facing WebUI and RPC response paths. An attacker could possibly use this issue to trick users into performing unintended actions. It was discovered that Transmission had a clickjacking weakness in the browser-facing WebUI and RPC response paths. An attacker could possibly use this issue to trick users into performing unintended actions. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 26.04 LTS resolute transmission – 4.1.1+dfsg-1ubuntu1.1 transmission-daemon – 4.1.1+dfsg-1ubuntu1.1 25.10 questing transmission – 4.1.0~beta2+dfsg-3ubuntu1.1 transmission-daemon – 4.1.0~beta2+dfsg-3ubuntu1.1 24.04 LTS noble transmission – 4.0.5-1ubuntu0.1 transmission-daemon – 4.0.5-1ubuntu0.1 22.04 LTS jammy transmission – 3.00-2ubuntu2.2 transmission-daemon – 3.00-2ubuntu2.2 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-38978 CVE-2026-38978