Exploited CVEs / Palo Alto Networks / CVE-2026-0257
CVE-2026-0257
Palo Alto Networks PAN-OS Authentication Bypass Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2026-06-01 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Palo Alto Networks Security Advisories, linked below.
Actively exploited Palo Alto Networks PAN-OS vulnerability, Critical severity, CVSS 9.1. Added to the CISA KEV catalog 2026-05-29.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-0257
This PAN-OS flaw lets an attacker skip authentication entirely and stand up an unauthorized VPN connection into your network, which is a gateway-level compromise rather than a foothold on a single host. With a 94 percent EPSS score, confirmed CISA KEV exploitation as of 2026-05-29, and active use in ransomware campaigns, internet-facing firewalls are the specific target here. Any PAN-OS device answering VPN requests from the internet should be treated as at imminent risk.
Do this: Apply the Palo Alto Networks PAN-OS fix for CVE-2026-0257 to all internet-facing firewalls now and audit VPN session and authentication logs for unauthorized connections.
AI-generated from public data, 2026-07-25. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-0257
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-0257
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-06-01 (past due).
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2026-0257
The authoritative fix and affected-version list are published by the vendor. Find the PAN-OS advisory on Palo Alto Networks Security Advisories.
Common questions about CVE-2026-0257
Is CVE-2026-0257 actively exploited?
Yes. CVE-2026-0257 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-05-29, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 94%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2026-0257?
CISA set the federal (BOD 22-01) remediation due date at 2026-06-01, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2026-0257?
The authoritative fix is in the vendor advisory: see Palo Alto Networks Security Advisories for the patched PAN-OS versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-0257?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-0257's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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All Palo Alto Networks exploited CVEs on one page: Palo Alto Networks vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
