What is CVE-2026-0257?
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.
The record classifies CVE-2026-0257 under weakness class CWE-565. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 169 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.1 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS v4.0 base score
- 7.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red - EPSS (FIRST)
- 96.8% probability of exploitation in the next 30 days, higher than 99.8% of all scored CVEs
- CISA KEV
- Listed since 2026-05-29, federal remediation deadline 2026-06-01 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2026-05-13, last modified 2026-07-14
Is CVE-2026-0257 being exploited?
CISA added CVE-2026-0257 to the Known Exploited Vulnerabilities catalog on 2026-05-29, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-06-01 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2026-0257 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (javascript/cves/2026/CVE-2026-0257.yaml). It currently carries a trending score of 60 in the Threadlinqs vulnerability feed.
- sfewer-r7/CVE-2026-0257 (github)
- 0xBlackash/CVE-2026-0257 (github)
- tushargurav28/CVE-2026-0257 (github)
- akashsingh0454/CVE-2026-0257-PoC (github)
- grayxploit/CVE-2026-0257 (github)
- HORKimhab/CVE-2026-0257 (github)
- Ez4rd1x1/CVE-2026-0257 (github)
- trickest/cve (trickest)
Affected products and versions
- Paloaltonetworks: Pan-Os, Prisma Access
How to fix CVE-2026-0257
Vendor advisory: https://security.paloaltonetworks.com/CVE-2026-0257. Because CVE-2026-0257 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-06-01. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-0257
11 tracked threats in the Threadlinqs corpus reference CVE-2026-0257, either in the campaign’s CVE list or as an indicator on the campaign record.
- October 21 Roundup: PHP2Shell (CVE-2026-109618/109619), LiteLLM 1.107.0 Supply-Chain Backdoor, Palo Alto GlobalProtect CVE-2026-0257 Exploitation — CRITICAL · 2026-10-23
- k0t (CryptoFeel / Scrooge) Network-Edge Intrusion Campaign Targeting FortiGate, FortiWeb and GlobalProtect (CVE-2025-64446, CVE-2026-0257) — HIGH · 2026-10-21
- Weekly threat digest (week ending 2026-06-07): PAN-OS GlobalProtect CVE-2026-0257 exploitation, React2Shell CVE-2025-55182 abuse by APT-C-26, and npm/state-actor campaigns — HIGH · 2026-10-18
- PAN-OS GlobalProtect/Prisma Access Authentication Bypass CVE-2026-0257 Exploited by Qilin and Settra Ransomware (ThreatsDay Bulletin: SiteGuard WAF CVE-2026-106931, Adobe AEM RCE Chain, Noir Wallet Drainer) — CRITICAL · 2026-10-15
- CyberXero: AI-Augmented Initial Access Broker Targeting Ukrainian Critical Infrastructure and Global WordPress/E-commerce Platforms — HIGH · 2026-10-07
- Qilin Ransomware Suspect Arrested in Japan, Extradited to Germany; Qilin Affiliate Exploited Check Point VPN Zero-Day CVE-2026-50751 — HIGH · 2026-10-07
- 2026 Ransomware Surge Targeting US Organizations: Identity-First Compromise, BYOVD, and Living-Off-the-Cloud Exfiltration (Qilin, Akira, Clop, INC Ransom, Play, DragonForce, Sinobi) — HIGH · 2026-08-23
- ChocoPoC RAT Campaign Uses Malicious PoC-Exploit Python Packages to Backdoor Security Researchers — HIGH · 2026-07-02
- ChocoPoC Campaign: Trojanised PoC Exploits and PyPI Packages Deliver Python RAT Using Mapbox Datasets API as Dead-Drop C2 — HIGH · 2026-07-02
- ChocoPoC: Python RAT Distributed via Trojanized PoC Exploits Targeting Security Researchers — HIGH · 2026-07-01
- Palo Alto Networks PAN-OS / Prisma Access GlobalProtect Authentication Bypass (CVE-2026-0257) — Active Exploitation, CISA KEV — CRITICAL · 2026-05-29
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on .