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PHP, any version since 5.4
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Patch Tuesday, every day.
Two flaws nicknamed PHP2Shell (CVE-2026-109618 and CVE-2026-109619, both rated 9.2) let a stranger run code on a PHP web server without logging in. Every version back to 5.4 has at least one of them, the details leaked a day before the fixes, and attacks started within hours. If you run PHP, update to 8.5.12, 8.4.27, 8.3.36 or 8.2.35 today, then come back and finish reading this row.
We do not link to the smart one. You can find it.
The dumb one is the Hardback guestbook.