CVE-2026-0257

Palo Alto Networks PAN-OS authentication bypass, confirmed exploited in the wild.

Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.

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96%chance of exploitation in the next 30 days (EPSS), 99th percentile

29 Mayadded to CISA's Known Exploited Vulnerabilities list, 2026

1 Junfederal remediation deadline, already passed

Passedpast the deadline: patch now

CISA's name for it	Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Vendor and product	Palo Alto Networks · PAN-OS
Type	authentication bypass · CWE-565
Exploited	Confirmed by CISA listed 29 May 2026
Likelihood	one of the most likely to be exploited of every vulnerability tracked
Deadline	1 June 2026 · already passed
Used in ransomware	Yes: CISA reports it used in ransomware campaigns
Advisories	security.paloaltonetworks.com ↗ · nvd.nist.gov ↗

What to do

Three steps, in this order

Step 1

Apply the vendor fix and restart the affected service.

Step 2

Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant.

Step 3

Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.

CISA's 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.

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Questions

CVE-2026-0257 in short

Is CVE-2026-0257 being exploited?

Yes. CISA added CVE-2026-0257 to its Known Exploited Vulnerabilities catalogue on 29 May 2026, which it does only on evidence of exploitation in the wild.

What is the CISA deadline for CVE-2026-0257?

US federal agencies must remediate it by 1 June 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.

How likely is CVE-2026-0257 to be exploited in the next 30 days?

FIRST's Exploit Prediction Scoring System gives it 96%, the 99th percentile of every CVE it scores.

How do I fix CVE-2026-0257?

Apply the vendor fix and restart the affected service. Put the login or management interface behind a VPN or allow-list; a bypass makes passwords irrelevant. Rotate credentials and session keys the product holds, and review accounts and configuration changes since the listing date.

Same vendor

Other Palo Alto Networks vulnerabilities being exploited

CVE	Product	Type	Listed
CVE-2026-0322	PAN-OS	remote code execution	14 October 2026
CVE-2026-0300	PAN-OS	remote code execution	6 May 2026

Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.