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CVE-2026-56126— pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php

Quick assessment

Affected
Netgate pfSense Plus
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.

Netgate pfsense plus是斯洛伐克Netgate公司的一款提供防病毒与网络入侵检测防御功能的网络安全设备。 Netgate pfsense plus 26.07之前版本和pfSense CE 2.9.0之前版本存在跨站脚本漏洞，该漏洞源于/status_monitoring.php中的graph-left、graph-right等多个图形配置参数在写入全局pfSense XML配置及页面渲染时缺少清理和转义，可能导致拥有Status: Monitoring权限的认证用户注入任意JavaSc

CVSS 5.4 · Medium EPSS 1.05% · P63

Affected Version Matrix 2

VendorProduct Version RangeStatus
Netgate pfSense CE < 2.9.0 affected
Netgate pfSense Plus < 26.07 affected
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I. Basic Information for CVE-2026-56126

Vulnerability Information
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Vulnerability Title
pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php
Source: CVE Program / CVE List V5
Vulnerability Description
pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Status: Monitoring privilege to inject arbitrary JavaScript via graph configuration parameters in /status_monitoring.php. Multiple POST parameters including graph-left, graph-right, time-period, resolution, start-date, end-date, start-time, end-time, graph-type, invert, and refresh-interval are concatenated and written to the global pfSense XML configuration without sanitization, then echoed unsanitized into a JavaScript string context on page render. Because the setting is stored in the global configuration, the payload executes in the browser of every user who visits the Status: Monitoring page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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
Netgate pfsense plus 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netgate pfsense plus是斯洛伐克Netgate公司的一款提供防病毒与网络入侵检测防御功能的网络安全设备。 Netgate pfsense plus 26.07之前版本和pfSense CE 2.9.0之前版本存在跨站脚本漏洞，该漏洞源于/status_monitoring.php中的graph-left、graph-right等多个图形配置参数在写入全局pfSense XML配置及页面渲染时缺少清理和转义，可能导致拥有Status: Monitoring权限的认证用户注入任意JavaSc
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
Netgate pfSense Plus 0 ~ 26.07 -
Netgate pfSense CE 0 ~ 2.9.0 -

II. Public POCs for CVE-2026-56126

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III. Intelligence Information for CVE-2026-56126

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Vendor Advisories for CVE-2026-56126 (2)

Vendor Pages for CVE-2026-56126 (2)

Same Patch Batch · Netgate · 2026-09-03 · 3 CVEs total

CVE-2026-56127 5.4 MEDIUM pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_rules_edit.php
CVE-2026-56128 5.4 MEDIUM pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.php

IV. Related Vulnerabilities

Same product: pfSense Plus
Same vendor: Netgate
Same weakness: CWE-79

V. Comments for CVE-2026-56126

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