Ubuntu Security Notice 2920-1 – It was discovered that the ContainerNode::parserRemoveChild function in Blink mishandled widget updates in some circumstances. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass same-origin restrictions. It was discovered that the PPB_Flash_MessageLoop_Impl::InternalRun function in Chromium mishandled nested message loops. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit this to bypass same-origin restrictions. Various other issues were also addressed.