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Palo Alto Networks PAN-OS 11.1.x < 11.1.14 / 11.2.x < 11.2.11 / 12.1.x < 12.1.5 Vulnerability

low Nessus Plugin ID 320387

Synopsis

The remote PAN-OS host is affected by a vulnerability

Description

The version of Palo Alto Networks PAN-OS running on the remote host is 11.1.x prior to 11.1.14, 11.2.x prior to 11.2.11, or 12.1.x prior to 12.1.5. It is, therefore, affected by a vulnerability.

 A cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS software enables a malicious authenticated administrator to store a JavaScript payload using the web interface.

 This issue is applicable to PAN-OS software on PA-Series and VM-Series firewalls and on Panorama (virtual and M-Series).

 Cloud NGFW and Prisma Access are not affected by this vulnerability.

Tenable has extracted the preceding description block directly from the PAN-OS security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to PAN-OS 11.1.14 / 11.2.11 / 12.1.5 or later

See Also

https://security.paloaltonetworks.com/CVE-2026-0266

Plugin Details

Severity: Low

ID: 320387

File Name: palo_alto_CVE-2026-0266.nasl

Version: 1.1

Type: Combined

Published: 6/10/2026

Updated: 6/10/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: Low

Base Score: 3.5

Temporal Score: 2.6

Vector: CVSS2#AV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS Score Source: CVE-2026-0266

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Low

Base Score: 2.4

Threat Score: 0.4

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:paloaltonetworks:pan-os

Required KB Items: Host/Palo_Alto/Firewall/Version, Host/Palo_Alto/Firewall/Full_Version, Host/Palo_Alto/Firewall/Source, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 6/10/2026

Vulnerability Publication Date: 6/10/2026

Reference Information

CVE: CVE-2026-0266

CWE: 79