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cve recordcriticalexploited in the wild3 of 3 cataloguesransomwareexploit reported

CVE-2026-0257

Palo Alto Networks · PAN-OS · Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Published · Added to CISA KEV
CVSS9.1
Severitycritical
WeaknessCWE-565
EPSS96.9%99.9th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueJun 1, 2026

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

patch window

Called exploited 16 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing16d
  3. Last sighting2mo

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by0 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

13 public reports collected from VulnCheck and CIRCL, first on May 29, 2026. Each links to its original source. We have not verified them.

Description

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

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Our coverage of CVE-2026-0257

CVE-2008-4128high

July 2026 CVE Landscape

Cybersecurity researchers identified 85 high-impact vulnerabilities in July 2026 that require urgent remediation, marking a 44% increase from the previous month. Of these, 36 were assigned a "Very Critical" risk score by Insikt Group. The vulnerabilities affected products from 61 vendors, with Microsoft accounting for approximately 12% of the total.

CVE-2026-0257high

Qilin Ransomware Attackers Exploit PAN-OS Authentication Bypass for Initial Access

Threat actors associated with the Qilin ransomware, also known as Agenda, have reportedly leveraged a high-severity authentication bypass vulnerability in Palo Alto Networks PAN-OS as an initial access vector into victim networks. Security researchers at Arctic Wolf Labs observed multiple intrusions in June 2026 where the exploitation of this specific flaw marked the starting point of the…