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CVE-2026-49131— OPNsense < 26.1.9 Stored XSS via Firewall Rule Description Field

Quick assessment

Affected
Deciso B.V. OPNsense
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.

OPNsense是OPNsense组织的一款网络防火墙与路由器操作系统。 OPNsense 26.1.9之前版本存在跨站脚本漏洞，该漏洞源于通过filter API端点将payload嵌入防火墙规则描述字段，未清理的描述值被持久化并通过opnsense_bootgrid.js渲染为innerHTML，可能导致查看防火墙规则页面的已认证用户遭受存储型跨站脚本攻击，造成会话劫持或凭据窃取。

CVSS 5.4 · Medium EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
Deciso B.V. OPNsense < 26.1.9 affected
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I. Basic Information for CVE-2026-49131

Vulnerability Information
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Vulnerability Title
OPNsense < 26.1.9 Stored XSS via Firewall Rule Description Field
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense before 26.1.9 contains a stored cross-site scripting vulnerability that allows authenticated attackers with firewall rule management privileges to inject arbitrary HTML or JavaScript by embedding payloads in the firewall rule description field via the filter API endpoint. The unsanitized description value is persisted and later rendered through the default cell formatter in opnsense_bootgrid.js, which assigns raw cell content to innerHTML, causing injected scripts to execute in the browser of any authenticated user who views the Firewall Rules page, enabling session hijacking or credential theft.
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
OPNsense 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OPNsense是OPNsense组织的一款网络防火墙与路由器操作系统。 OPNsense 26.1.9之前版本存在跨站脚本漏洞，该漏洞源于通过filter API端点将payload嵌入防火墙规则描述字段，未清理的描述值被持久化并通过opnsense_bootgrid.js渲染为innerHTML，可能导致查看防火墙规则页面的已认证用户遭受存储型跨站脚本攻击，造成会话劫持或凭据窃取。
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
Deciso B.V. OPNsense 0 ~ 26.1.9 -

II. Public POCs for CVE-2026-49131

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III. Intelligence Information for CVE-2026-49131

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Patches & Fixes for CVE-2026-49131 (1)

Vendor Advisories for CVE-2026-49131 (1)

IV. Related Vulnerabilities

Same product: OPNsense
Same vendor: Deciso B.V.
Same weakness: CWE-79