- How update notices relate to cyber attacks
- Three terms to look for in update information
- Why to hurry when a flaw is being exploited
- Rules that keep a company from putting updates off
Short answer
Update notices for operating systems and apps can include not only new features but also fixes for weaknesses (vulnerabilities) that attackers use. Once a fix is published, the weakness becomes known, and devices that have not been updated become easier targets. If a notice mentions "security", "vulnerability" or "being exploited", do not put it off. Japan's Information-technology Promotion Agency (IPA) also asks people to apply fixes to the operating systems and software on their computers and phones, and to keep the firmware of devices such as Wi-Fi routers up to date.
How updates and attacks are connected
A vulnerability is a flaw in how software is built that allows actions that should not be possible. Attackers use these flaws to take control of devices or steal information. In IPA's "10 Major Security Threats 2026", "attacks exploiting system vulnerabilities" ranks fourth in the list for organisations.
An update is there to close the flaw, but it only works once it is installed. If you put it off for weeks because restarting is a hassle or you are busy, you keep using a device with a known weakness for that whole time.
Which update notices are urgent?
- "Being exploited"
- Urgent alerts
- Security updates
- Vulnerability fixes
- New features, design changes
- At work, test on one machine first
Three terms to look for in update information
You do not need to read every word of an update notice or alert. These three terms tell you roughly how urgent it is.
| Term | Meaning | Guide |
|---|---|---|
| Security update, vulnerability fix | An update that closes a weakness | Install soon |
| Being exploited | Used in real attacks | Install now |
| CVE or JVN number | An ID for each vulnerability | A key for looking it up |
For example, in October 2026 IPA urged people to apply a Microsoft update "immediately", because it fixed a vulnerability that had been confirmed as exploited. In Japan, JVN, run by JPCERT/CC and IPA, gives each vulnerability an ID and publishes the affected products and countermeasures. In the United States, CISA publishes a catalogue of vulnerabilities that have been exploited and recommends using it to decide what to fix first.
Keeping a company from putting updates off
On personal devices, turning on automatic updates is the most reliable approach. Companies sometimes hold back updates for fear of breaking business software. Even then, set rules so that updates are not held back indefinitely.
For example, rules such as "install anything confirmed as exploited within the week" and "test everything else on one machine, then roll it out to all machines within the month" cut down the time spent deciding. Beyond computers, decide who watches updates for routers, network equipment and the systems behind your website. Products whose support has ended no longer receive updates, so their weaknesses stay open; plan to replace or migrate them.
If the problem is not solved
If an update will not install on your own device, check the official help from the provider of the operating system or app. For company equipment, ask the IT staff or the maintenance contractor which updates are planned and when. Alerts can be checked on IPA's important security information pages and on JVN.
Checklist
- Are automatic updates turned on for your computer and phone?
- Are any updates waiting for a restart?
- Have you checked the firmware of your router and similar devices recently?
- Is there a rule to install updates for exploited flaws right away?
- Are you still using products whose support has ended?
One thing to check today
Open the settings on your computer and phone and check for updates you have not installed and updates waiting for a restart.