CVE-2026-0279 PAN-OS: Multiple Cross-Site Scripting (XSS) Vulnerabilities
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.
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.
Product Status
| Versions | Affected | Unaffected |
|---|---|---|
| Cloud NGFW | None | All |
| PAN-OS 12.1 | < 12.1.8 | >= 12.1.8 |
| PAN-OS 11.2 | < 11.2.13 | >= 11.2.13 |
| PAN-OS 11.1 | < 11.1.16 | >= 11.1.16 |
| PAN-OS 10.2 | All | None |
| Prisma Access 11.2.0 | < 11.2.7-h18* | >= 11.2.7-h18* |
| Prisma Access 10.2.0 | < 10.2.10-h39* | >= 10.2.10-h39* |
* This is a low severity vulnerability for Prisma Access. Please refer to the Severity section for impact details. Palo Alto Networks will upgrade all customers during the next scheduled maintenance cycle. Customers who require an upgrade prior to this cycle should contact Palo Alto Networks Support or their account teams to schedule an on-demand software upgrade window.
Required Configuration for Exposure
No special configuration is required to be affected by this issue.
Severity: LOW, Suggested Urgency: MODERATE
The risk is highest when you allow access to the management interface from external IP addresses on the internet.
LOW
- CVSS-BT: 1.3 /CVSS-B: 5.3 (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/AU:N/R:U/V:D/RE:M/U:Amber)
You can reduce the risk of exploitation by restricting access to a jump box that is the only system allowed to access the management interface.
LOW
- CVSS-BT: 1.2 /CVSS-B: 5.1 (CVSS:4.0/AV:A/AC:L/AT:N/PR:N/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)
The risk of exploitation is lower for Prisma Access as it requires an authenticated user and the external network access to the management interface is restricted.
LOW
- CVSS-BT: 0.4 /CVSS-B: 2.4 (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)
Exploitation Status
Palo Alto Networks is not aware of any malicious exploitation of these issues.
Weakness Type and Impact
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63 Cross-Site Scripting (XSS)
Solution
| Version | Minor Version | Suggested Solution |
|---|---|---|
| Cloud NGFW All | No action needed. | |
| PAN-OS 12.1 | 12.1.2 through 12.1.7-h* | Upgrade to 12.1.8 or later. |
| PAN-OS 11.2 | 11.2.0 through 11.2.12 | Upgrade to 11.2.13 or later. |
| PAN-OS 11.1 | 11.1.0 through 11.1.15-h* | Upgrade to 11.1.16 or later. |
| PAN-OS 10.2 | 10.2.0 through 10.2* | Upgrade to 11.1.16, 11.2.13, 12.1.8 or later. |
| All older unsupported PAN-OS versions | Upgrade to a supported fixed version. | |
| Prisma Access 11.2 | 11.2.0 through 11.2.7 | Upgrade to 11.2.7-h18 or later.* |
| Prisma Access 10.2 | 10.2.0 through 10.2.10 | Upgrade to 10.2.10-h39 or later.* |
* See the note under Product Status for information regarding Prisma Access upgrades.
Workarounds and Mitigations
The vast majority of firewalls already follow Palo Alto Networks' and industry best practices. However, if you have not already, we strongly recommend that you secure access to your management interface according to our best practice deployment guidelines. Specifically, you should restrict management interface access to only trusted internal IP addresses.
Review information about how to secure management access to your Palo Alto Networks firewalls:
- Palo Alto Networks LIVEcommunity article
- Palo Alto Networks official and detailed technical documentation
Acknowledgments
CPEs
cpe:2.3:o:palo_alto_networks:pan-os:12.1.7:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:12.1.6:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:12.1.5:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:12.1.3:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:12.1.2:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:11.2.12:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:11.2.11:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:*:*:*:*:*:*:*
cpe:2.3:o:palo_alto_networks:pan-os:11.2.9:*:*:*:*:*:*:*
CPE Applicability
- cpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:* is vulnerable from (including)12.1.0 and up to (excluding)12.1.8
- ORcpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:* is vulnerable from (including)11.2.0 and up to (excluding)11.2.13
- ORcpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:* is vulnerable from (including)11.1.0 and up to (excluding)11.1.16
- ORcpe:2.3:o:palo_alto_networks:pan-os:*:*:*:*:*:*:*:* is vulnerable from (including)10.2.0
- or
- cpe:2.3:o:palo_alto_networks:prisma_access:*:*:*:*:*:*:*:* is vulnerable from (including)11.2.7 and up to (excluding)11.2.7-h18
- ORcpe:2.3:o:palo_alto_networks:prisma_access:*:*:*:*:*:*:*:* is vulnerable from (including)10.2.10 and up to (excluding)10.2.10-h39