How severe is CVE-2026-0257?

CVE-2026-0257 has a CVSS score of 9.1/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-0257?

Affected package information for CVE-2026-0257 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2026-0257?

No fixed version has been published for CVE-2026-0257 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2026-0257 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2026-0257, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2026-0257?

CVE-2026-0257 has an EPSS (Exploit Prediction Scoring System) score of 58.8%, placing it in the 98th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2026-0257 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2026-0257 (Palo Alto Networks PAN-OS Authentication Bypass Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-05-29. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-06-01. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2026-0257?

CVE-2026-0257 is classified as CWE-565 (CWE-565). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2026-0257?

CVE-2026-0257 affects paloaltonetworks pan-os (44 versions, e.g. 10.2.7, 10.2.8, 10.2.9…); paloaltonetworks prisma access; siemens ruggedcom ape1808 firmware. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2026-0257 published, and has it been updated?

CVE-2026-0257 was published on May 13, 2026 and was last updated on June 9, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2026-05-29 — agencies required to remediate by 2026-06-01

CVE-2026-0257

CRITICAL

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…

Published

May 13, 2026

Updated

Jun 9, 2026

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

58.8%probability of exploitation in next 30 days

High Risk98th percentile+17.28%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

3 products · 162 configurations

pan-ospaloaltonetworks

< 10.2.7

44 versions

10.2.710.2.810.2.910.2.1010.2.1110.2.1210.2.1310.2.1410.2.1510.2.1610.2.1710.2.18

Application

prisma accesspaloaltonetworks

all

ruggedcom ape1808 firmwaresiemens

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

sfewer-r7/CVE-2026-0257

Proof-of-concept script to leverage the PAN-OS GlobalProtect authenticat

⭐ 20🍴 6Jun 2026

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2026-0257 in your stack?

O3 detects CVE-2026-0257 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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