How severe is CVE-2026-0257?

CVE-2026-0257 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-0257 being actively exploited?

Yes. CVE-2026-0257 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-05-29, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-0257?

CVE-2026-0257 primarily affects Paloaltonetworks Pan-os. In total, 162 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-0257?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-0257 have an EU (EUVD) identifier?

Yes. CVE-2026-0257 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30104. It is also flagged as exploited in the EUVD (since 2026-05-29).

When was CVE-2026-0257 published?

CVE-2026-0257 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-0257

CVE-2026-0257 is a critical-severity vulnerability in Paloaltonetworks Pan-os with a CVSS 3.x base score of 9.1. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-05-29). The underlying weakness is classified as CWE-565.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 7.8
EPSS exploit prediction: 87% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-05-29)
EU (EUVD) id: EUVD-2026-30104
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-05-29)
Weakness: CWE-565
Affected product: Paloaltonetworks Pan-os
Published: 2026-05-13
Last modified: 2026-06-17

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.

Frequently asked questions

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.
How severe is CVE-2026-0257?: CVE-2026-0257 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-0257 being actively exploited?: Yes. CVE-2026-0257 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-05-29, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-0257?: CVE-2026-0257 primarily affects Paloaltonetworks Pan-os. In total, 162 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-0257?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-0257 have an EU (EUVD) identifier?: Yes. CVE-2026-0257 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30104. It is also flagged as exploited in the EUVD (since 2026-05-29).
When was CVE-2026-0257 published?: CVE-2026-0257 was published on 2026-05-13 and last updated on 2026-06-17.

References

Affected products (162)

cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:-:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h1:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h12:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h16:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h18:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h19:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h21:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h24:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h3:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h32:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h6:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h8:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:*:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:*:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:-:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h10:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h12:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h14:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h17:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h18:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h2:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h21:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h27:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h3:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h30:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h31:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h4:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h5:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h7:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h9:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:*:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:*:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:-:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h1:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h10:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h16:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h18:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h2:*:*:*:*:*:*
cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h3:*:*:*:*:*:*

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