On 2026-05-29, CISA added CVE-2026-0257 (Palo Alto Networks PAN-OS) to its Known Exploited Vulnerabilities (KEV) catalog [2]. The vulnerability is listed in the catalog as "Palo Alto Networks PAN-OS Authentication Bypass Vulnerability" [2]. CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Backfill: this event became public on May 29, 2026 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds Palo Alto Networks PAN-OS Vulnerability CVE-2026-0257 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- May 29, 2026
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 95.6%, higher than 100% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with the listed vendor mitigation guidance; see the original text in the body for specific requirements [2].
Timeline
Technical details
CISA KEV Listing Record
CISA added CVE-2026-0257 (Palo Alto Networks PAN-OS) to the Known Exploited Vulnerabilities () catalog on 2026-05-29 [2].
Original Technical Description
Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized connection. [2]
Official 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. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2026-0257 [1].
References
Official / primary3
- [1]
“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.”
- [2]
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.