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Sead Fadilpašić

Palo Alto warns of critical firewall flaw, tells users a patch is on the way

Palo Alto Palo Alto Networks
Caution sign data unlocking hackers. Malicious software, virus and cybercrime, System warning hacked alert, cyberattack on online network, data breach, risk of website.
  • A critical buffer overflow flaw (CVE‑2026‑0300) in PAN‑OS User‑ID Authentication Portal is under limited exploitation
  • The bug allows unauthenticated code execution with root privileges on exposed firewalls
  • Palo Alto advised restricting portals to trusted networks; fixes are due May 13, 2026

PAN-OS User-ID Authentication Portal, a feature in Palo Alto Networks firewalls that identifies and authenticates users on a network, contains a critical-severity zero-day vulnerability which is being exploited in limited attacks, the company has warned.

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