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CVE-2026-57154— OPNsense: Configuration line injection via multiple GUI text fields

Quick assessment

Affected
opnsense core
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 是一个基于 FreeBSD 的防火墙与路由平台。在 26.1.11 和 26.4.1p1 版本之前，拥有对受影响设置之委托访问权限的已认证 Web UI 或 API 用户，可在预期仅包含单行的字段中提交回车（CR）或换行（LF）字符，导致生成的特权服务配置文件包含由攻击者控制的额外指令或策略行。已确认受影响的 Dnsmasq 路径包括 dhcp_boot.filename、dhcp_boot.servername、dhcp_boot.address 和 dhcp_options.value，这些字

CVSS 8.1 · High EPSS 0.46% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
opnsense core < 26.1.11 affected
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I. Basic Information for CVE-2026-57154

Vulnerability Information
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Vulnerability Title
OPNsense: Configuration line injection via multiple GUI text fields
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.11 and 26.4.1p1, authenticated Web UI or API users with delegated access to affected settings can submit CR or LF characters in fields expected to contain one line, causing generated privileged service configuration files to contain additional attacker-controlled directives or policy lines. The confirmed Dnsmasq path includes dhcp_boot.filename, dhcp_boot.servername, dhcp_boot.address, and dhcp_options.value, which are rendered into /usr/local/etc/dnsmasq.conf; access through page-services-dnsforwarder covers api/dnsmasq/*. Related affected fields span OpenVPN, DHCPv6, Unbound, IPsec, NTP, PPP or MPD, Monit, firewall, sudo, WebGUI, and System General configuration. Applying or restarting the affected service can alter behavior beyond the delegated setting, create service-side files, cross RBAC boundaries, or cause denial of service. Line injection through Monit mail password and adjacent Monit text fields into /usr/local/etc/monitrc demonstrated root command execution. Arbitrary shell command execution was not confirmed for the Dnsmasq path. This issue is fixed in versions 26.1.11 and 26.4.1p1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
opnsense core < 26.1.11 -

II. Public POCs for CVE-2026-57154

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III. Intelligence Information for CVE-2026-57154

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Vendor Advisories for CVE-2026-57154 (1)

Other References for CVE-2026-57154 (2)

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-74