CVE-2026-0316 in PAN-OS
Summary
by MITRE • 10/14/2026
A stored cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenticated administrator to store or execute a JavaScript payload using the web interface.
The security risk posed by this issue is minimized when the management interface 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 and Prisma® Access are not affected by these vulnerabilities.
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Analysis
by VulDB Data Team • 10/14/2026
A critical stored cross-site scripting vulnerability has been identified within the Palo Alto Networks PAN-OS management interface, allowing a malicious authenticated administrator to inject and execute arbitrary JavaScript payloads. This flaw resides in specific input fields or configuration parameters that fail to properly sanitize user-supplied data before rendering it back to other users or executing it directly by the browser context of an administrative session. Unlike reflected XSS where the payload is delivered via a link, stored XSS persists on the server side, meaning the malicious script is saved within the application's database or configuration files and subsequently served to any administrator who accesses the affected page. This persistence mechanism significantly amplifies the risk profile, as the attack does not require complex social engineering to trigger; simply accessing the compromised interface can initiate the execution of the injected code in the context of the victim's active session.
The technical nature of this vulnerability aligns with CWE-79, which classifies improper neutralization of input during web page generation. By exploiting insufficient output encoding or validation mechanisms within the PAN-OS web application framework, an attacker can bypass standard security controls to execute scripts that operate under the privileges of the authenticated administrator account. This capability enables a wide range of malicious activities including session hijacking, where the attacker steals administrative cookies to impersonate legitimate users; keylogging to capture sensitive credentials and configuration data; or performing actions on behalf of the victim without their knowledge. The impact is particularly severe because it targets privileged accounts, effectively granting the attacker full control over the firewall's security policies, network configurations, and logging mechanisms.
From an operational perspective, this vulnerability poses a significant threat to organizations that rely on PAN-OS for perimeter defense or cloud connectivity. If exploited, an adversary could disable critical security features such as intrusion prevention systems, malware protection, or URL filtering, thereby exposing the internal network to external threats. Furthermore, the attacker could modify routing tables or access control lists to facilitate lateral movement within the enterprise network or redirect traffic through a compromised node for interception and analysis. The scope of this vulnerability encompasses PA-Series physical firewalls, VM-Series virtualized firewalls deployed in various cloud environments, as well as Panorama management servers including both virtual appliances and M-series hardware units. It is important to note that Cloud NGFW and Prisma Access services are not affected by these specific vulnerabilities due to their distinct architectural designs and separate codebases.
Mitigation strategies must prioritize immediate remediation through software updates provided by Palo Alto Networks, which address the underlying input validation flaws in the management interface. In scenarios where patching is delayed or unavailable for legacy systems, network segmentation plays a crucial role in risk reduction. As highlighted in industry best practices, restricting access to the management interface exclusively to trusted internal IP addresses significantly minimizes the attack surface by preventing external actors from reaching the vulnerable endpoints. This aligns with ATT&CK technique T1078, which involves valid accounts and credentials, as limiting administrative access reduces the likelihood of unauthorized entities obtaining the necessary authentication tokens to exploit this flaw. Additionally, implementing strict role-based access control ensures that only essential personnel have administrator privileges, thereby reducing the potential impact if a single account is compromised. Continuous monitoring for anomalous configuration changes or unusual JavaScript execution patterns in browser logs can also aid in early detection and response to such exploitation attempts.