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CVE-2026-56128— pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.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/firewall_schedule_edit.php中descr参数未经过HTML清理，且仅对单引号进行转义后插入/firewall_rules.php的HTML属性值，允许双引号逃逸，导致具有Firewall: Schedules: Edit权限的认证

CVSS 5.4 · Medium EPSS 1.05% · P63

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

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-2026-56128

Vulnerability Information
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Vulnerability Title
pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.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 Firewall: Schedules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_schedule_edit.php. The schedule description is stored without HTML sanitization and subsequently inserted into an HTML attribute value in /firewall_rules.php with only single-quote escaping applied, permitting double-quote breakout. The payload executes in the browser of any user with the Firewall: Rules privilege who views the rules list with the affected schedule attached.
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/firewall_schedule_edit.php中descr参数未经过HTML清理，且仅对单引号进行转义后插入/firewall_rules.php的HTML属性值，允许双引号逃逸，导致具有Firewall: Schedules: Edit权限的认证
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-2026-56128

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III. Intelligence Information for CVE-2026-56128

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Vendor Advisories for CVE-2026-56128 (2)

Vendor Pages for CVE-2026-56128 (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-2026-56126 5.4 MEDIUM pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-56128

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