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CVE-2026-0256— PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface

Quick assessment

Affected
Palo Alto Networks Cloud NGFW
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Palo Alto Networks PAN-OS是美国Palo Alto Networks公司的一套为其防火墙设备开发的操作系统。 Palo Alto Networks PAN-OS存在跨站脚本漏洞，该漏洞源于存储型跨站脚本问题，可能导致恶意认证管理员使用Web界面存储JavaScript有效载荷。

AI Predicted 6.1 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 6

VendorProduct Version RangeStatus
Palo Alto Networks Cloud NGFW All unaffected
Palo Alto Networks PAN-OS 12.1.0< 12.1.7 affected
11.2.0< 11.2.12 affected
11.1.0< 11.1.15 affected
10.2.0< 10.2.18-h6 affected
Palo Alto Networks Prisma Access All unaffected
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I. Basic Information for CVE-2026-0256

Vulnerability Information
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Vulnerability Title
PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface
Source: CVE Program / CVE List V5
Vulnerability Description
A stored 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 impacted by this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Palo Alto Networks PAN-OS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Palo Alto Networks PAN-OS是美国Palo Alto Networks公司的一套为其防火墙设备开发的操作系统。 Palo Alto Networks PAN-OS存在跨站脚本漏洞，该漏洞源于存储型跨站脚本问题，可能导致恶意认证管理员使用Web界面存储JavaScript有效载荷。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Palo Alto Networks Cloud NGFW - -
Palo Alto Networks PAN-OS 12.1.0 ~ 12.1.7 cpe:2.3:o:palo_alto_networks:pan-os:12.1.6:*:*:*:*:*:*:*
Palo Alto Networks Prisma Access - -

II. Public POCs for CVE-2026-0256

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III. Intelligence Information for CVE-2026-0256

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Vendor Advisories for CVE-2026-0256 (1)

Same Patch Batch · Palo Alto Networks · 2026-05-13 · 26 CVEs total

CVE-2026-0238 Broker VM: Improper Input Validation in Broker VM Certificate and Key Fields
CVE-2026-0242 Trust Protection Foundation: SQL Injection Vulnerability
CVE-2026-0258 PAN-OS: Server-Side Request Forgery (SSRF) in IKEv2 Certificate URL Fetching
CVE-2026-0245 Prisma Access Agent: Information Disclosure Vulnerabilities
CVE-2026-0259 WildFire WF-500 and WF-500-B: Arbitrary File Read and Delete Vulnerability in WildFire App
CVE-2026-0236 Prisma Browser: Code Injection Enables Security Controls Bypass
CVE-2026-0241 Trust Protection Foundation: Multiple Authorization Bypass Vulnerabilities
CVE-2026-0261 PAN-OS: Authenticated Admin Command Injection Vulnerability
CVE-2026-0265 PAN-OS: Authentication Bypass with Cloud Authentication Service (CAS) enabled
CVE-2026-0243 Prisma SD-WAN: Denial of Service (DoS) Vulnerability Through IPv6 Crafted Packet
CVE-2026-0262 PAN-OS: Denial of Service Vulnerabilities in Network Traffic Parsing
CVE-2026-0237 Prisma Browser: Improperly Restricted Automation Bridge Allows Security Bypass
CVE-2026-0247 Prisma Access Agent Endpoint DLP: Authorization Bypass Vulnerabilities
CVE-2026-0250 GlobalProtect App: Buffer Overflow Vulnerability during connection to Portal or Gateway
CVE-2026-0264 PAN-OS: Heap-Based Buffer Overflow in DNS Proxy and DNS Server Allows Unauthenticated Remo
CVE-2026-0235 Prisma Browser: Access and Data Rule Bypass
CVE-2026-0251 GlobalProtect App: Local Privilege Escalation Vulnerabilities
CVE-2026-0249 GlobalProtect App: Certificate Validation Bypass Vulnerabilities
CVE-2026-0240 Trust Protection Foundation: Sensitive Information Disclosure Vulnerability
CVE-2026-0244 Prisma SD-WAN: Improper Certificate Validation Vulnerability

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Cloud NGFW
Same vendor: Palo Alto Networks
Same weakness: CWE-79

V. Comments for CVE-2026-0256

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