EUVD-2026-42682
GHSA-6cj9-cg4w-4m7x
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:D/RE:M/U:Amber
Network-reachable XSS requiring victim page load (UI:R); scope changes to victim browser context (S:C); no auth needed to inject payload (PR:N); no availability impact.
Primary rating from Vendor (paloaltonetworks).
CVSS VectorVendor: paloaltonetworks
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:D/RE:M/U:Amber
Lifecycle Timeline
2DescriptionCVE.org
Multiple cross site scripting vulnerabilities in the User-ID™ Authentication Portal (aka Captive Portal) service, GlobalProtect™ gateway/portal features and Clientless VPN of Palo Alto Networks PAN-OS® software enables a malicious unauthenticated user to store or execute malicious JavaScript payload.
The security risk posed by this issue is minimized when the management interface and access to the User-ID™ Authentication Portal is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 .
This issue is applicable to PAN-OS software on PA-Series and VM-Series firewalls and on Panorama (virtual and M-Series).
Cloud NGFW is not affected by this vulnerability.
AnalysisAI
Multiple stored and reflected cross-site scripting vulnerabilities in PAN-OS expose the User-ID Authentication Portal (Captive Portal), GlobalProtect gateway/portal, and Clientless VPN web interfaces to unauthenticated attackers who can inject and execute arbitrary JavaScript in victim browsers. Affected deployments span PA-Series and VM-Series firewalls and Panorama management platforms; Cloud NGFW is explicitly not affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a victim user to load the affected web page in their browser (UI:P - passive user interaction). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 1.3 - derived from a base that would otherwise score moderately - is strongly attenuated by the E:U (exploit unreported) supplemental metric, reflecting the current absence of known public exploits or active exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker identifies a publicly accessible Palo Alto GlobalProtect portal or Clientless VPN login page and submits a crafted JavaScript payload into a user-controlled input field (such as a login form or redirect parameter), which is then stored or reflected in subsequent page responses. A legitimate employee visiting the portal to authenticate has the attacker's script silently execute in their browser, potentially exfiltrating session tokens, authentication cookies, or credentials to an attacker-controlled endpoint. … |
| Remediation | Consult the Palo Alto Networks security advisory at https://security.paloaltonetworks.com/CVE-2026-0279 for exact patched PAN-OS versions and upgrade instructions; specific fix versions are not available in the current data set and should not be assumed. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Palo Alto Networks PAN-OS management web interface contains an authentication bypass allowing unauthenticated attackers
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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