Exploitation attempts against critical Atlassian flaw have begun (CVE-2026-21589)

Help Net Security reports active exploitation attempts against the critical Atlassian Data Center arbitrary file access vulnerability CVE-2026-21589 shortly after patches and a proof of concept were released. The feed also covers an ongoing FortiBleed campaign targeting internet-facing Fortinet FortiGate firewalls and SSL VPN gateways, reportedly compromising more than 86,644 devices and locking administrators out. Additional items discuss AI-driven security, SIEM, red teaming, phishing response, endpoint detection, third-party risk management, and hijacked ccTLD registries used to obtain una­