CVE-2026-0279

PAN-OS: Multiple Cross-Site Scripting (XSS) Vulnerabilities

Published Jul 9, 2026 CVSS 4.0 · 0.4 Low EPSS < 1% KEV · Not listed

Description

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.

Analysis

Technical impact

Multiple cross‑site scripting vulnerabilities (CWE‑79) exist in PAN‑OS components, including the User‑ID Authentication Portal (aka Captive Portal) and the GlobalProtect gateway/portal, allowing an unauthenticated user to store or execute malicious JavaScript payloads. The vulnerability can compromise the integrity of web interfaces and potentially enable an attacker to run arbitrary scripts in the victim’s browser context, leading to credential theft or session hijacking. The impact is confined to the web interfaces exposed by the firewall and the clientless VPN portals.

Affected Systems

The vulnerability affects PAN‑OS running on PA‑Series and VM‑Series firewalls as well as Panorama (virtual and M‑Series). It also affects Prisma Access, where versions ranging from 12.112.1.2 through 12.1.7-h*, 11.211.2.0 through 11.2*, and 10.210.2.0 through 10.2* are impacted; cloud‑based NGFWs are not affected.

Risk and Exploitability

The CVSS score is 0.4 and the EPSS score indicates an exploitation probability of less than 1%. The vulnerability is not in the CISA KEV catalog. The risk is low in line with the low CVSS score, but exploitation is possible if the interfaces are reachable from an untrusted network. Restricting access to trusted internal IP addresses reduces the likelihood of exploitation.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Palo Alto Networks

Cloud NGFW

unaffected

Version	Status	Constraints
`All`	unaffected	—

Palo Alto Networks

PAN-OS

affected

Version	Status	Constraints
`12.1.0`	affected	< 12.1.8
`11.2.0`	affected	< 11.2.13
`11.1.0`	affected	< 11.1.16
`10.2.0`	affected	< 10.2.18-h8

Palo Alto Networks

Prisma Access

affected

Version	Status	Constraints
`12.1.0`	affected	< 12.1.8
`11.2.0`	affected	—
`10.2.0`	affected	—

Configuration 1 [-]

OR	cpe:2.3:o:paloaltonetworks:pan-os::::::::
	cpe:2.3:o:paloaltonetworks:pan-os::::::::
	cpe:2.3:o:paloaltonetworks:pan-os::::::::

No data.

Vendor Product Versions

Palo Alto Networks

Cloud Ngfw

Version	Status	Scheme	Platform
`[0,*]`	unaffected	generic	—

Palo Alto Networks

Pan-os

Version	Status	Scheme	Platform
`[12.1.0,12.1.8)`	affected	semver	—
`[11.2.0,11.2.13)`	affected	semver	—
`[11.1.0,11.1.16)`	affected	semver	—
`[10.2.0,10.2.18-h8)`	affected	semver	—

Palo Alto Networks

Prisma Access

Version	Status	Scheme	Platform
`[12.1.0,12.1.8)`	affected	semver	—
`11.2.0`	affected	semver	—
`10.2.0`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade PAN-OS to a supported patched release – upgrade 12.1.x to 12.1.8 or later, 11.2.x to 11.2.13 or later, 11.1.x to 11.1.16 or later, and 10.x to 11.1.16, 11.2.13, or 12.1.8 or later; all older unsupported versions must also be upgraded.
Upgrade Prisma Access to a supported patched release – upgrade from 12.112.1.2–12.1.7-h*, 11.211.2.0–11.2*, and 10.210.2.0–10.2* to 12.1.8 or later, following the vendor’s guidance.
Restrict management interface and the User‑ID Authentication Portal to trusted internal IP addresses, following the vendor's best practice deployment guidelines.
Disable or block GlobalProtect gateway/portal and Clientless VPN features if they are not required, or enforce strict firewall policies to limit reachability from untrusted networks.

Generated by OpenCVE AI on August 1, 2026 at 14:00 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.750% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://cert-portal.siemens.com/productcert/html/ssa-104023.html
https://security.paloaltonetworks.com/CVE-2026-0279

History

Aug 11, 2026 4:00 PM Added references View changes

Type	Values Removed	Values Added
References		https://cert-portal.siemens.com/productcert/html/ssa-104023.html

Jul 9, 2026 10:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Palo Alto Networks cloud Ngfw
Vendors & Products		Palo Alto Networks cloud Ngfw

Jul 9, 2026 8:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 9, 2026 7:15 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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.
Title		PAN-OS: Multiple Cross-Site Scripting (XSS) Vulnerabilities
First Time appeared		Palo Alto Networks Palo Alto Networks pan-os Palo Alto Networks prisma Access
Weaknesses		CWE-79
CPEs		cpe:2.3:o:palo_alto_networks:pan-os:::::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.0:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:-:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h10:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h11:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h12:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h13:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h14:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h17:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h18:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h1:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h21:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h23:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h26:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h27:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h2:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h30:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h31:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h36:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h37:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h3:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h4:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h5:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h6:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h7:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h8:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.10:h9:::::: cpe:2.3:o:palo_alto_networks:pan-os:10.2.11:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.12:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.13:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.14:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.15:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.16:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.17:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.18:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.1:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.2:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.3:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.4:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.5:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.6:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.7:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.8:::::::* cpe:2.3:o:palo_alto_networks:pan-os:10.2.9:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.0:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.10:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.11:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.12:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.13:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.14:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.15:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.1:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.2:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.3:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.4:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.5:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.6:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.8:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.1.9:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.0:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.11:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.12:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.1:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.2:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.3:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.4:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.5:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.6:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:-:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h10:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h11:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h12:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h13:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h14:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h15:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h16:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h17:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h1:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h2:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h3:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h4:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h7:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.7:h8:::::: cpe:2.3:o:palo_alto_networks:pan-os:11.2.8:::::::* cpe:2.3:o:palo_alto_networks:pan-os:11.2.9:::::::* cpe:2.3:o:palo_alto_networks:pan-os:12.1.2:::::::* cpe:2.3:o:palo_alto_networks:pan-os:12.1.3:::::::* cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:::::::* cpe:2.3:o:palo_alto_networks:pan-os:12.1.5:::::::* cpe:2.3:o:palo_alto_networks:pan-os:12.1.6:::::::* cpe:2.3:o:palo_alto_networks:pan-os:12.1.7:::::::* cpe:2.3:o:palo_alto_networks:prisma_access::::::::
Vendors & Products		Palo Alto Networks Palo Alto Networks pan-os Palo Alto Networks prisma Access
References		https://security.paloaltonetworks.com/CVE-2026-0279
Metrics		cvssV4_0 `{'score': 0.4, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber'}`