A directory traversal vulnerability in the Captive Portal templates of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to execute arbitrary system commands as root via a crafted ZIP archive.

A command injection vulnerability in the component diagbackup.php of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to execute arbitrary commands via a crafted backup configuration file.

A command injection vulnerability in the component /api/cron/settings/setJob/ of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to execute arbitrary system commands.

Insecure permissions in the configuration directory (/conf/) of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allow attackers to access sensitive information (e.g., hashed root password) which could lead to privilege escalation.

DECISO OPNsense 23.1 does not impose rate limits for authentication, allowing attackers to perform a brute-force attack to bypass authentication.

/ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows XSS via openAction in app/controllers/OPNsense/Cron/ItemController.php.

OPNsense before 25.1.8 contains an authenticated command injection vulnerability in its Bridge Interface Edit endpoint (interfacesbridgeedit.php). The span POST parameter is concatenated into a system-level command without proper sanitization or escaping, allowing an administrator to inject arbitrary shell operators and payloads. Successful exploitation results in remote code execution with the privileges of the web service (typically root), potentially leading to full system compromise or lateral movement. This vulnerability arises from inadequate input validation and improper handling of user-supplied data in backend command invocations.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, unsanitized user input is passed to the DHCP configuration of the configured interface, which is processed by a shell script, allowing remote code execution as root on the underlying operating system. This vulnerability is fixed in 26.1.8.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, the XMLRPC method opnsense.restoreconfigsection fails to sanitize user supplied input leading to Remote Code Execution. This vulnerability is fixed in 26.1.7.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.8, an authenticated Remote Code Execution (RCE) vulnerability in the OPNsense core allows a user with user-management privileges to execute arbitrary system commands as root. An attacker can bypass input validation by formatting their malicious payload as a compliant email address, allowing shell commands to reach the underlying operating system. The flaw exists in the local user synchronization flow, within core/src/opnsense/scripts/auth/syncuser.php. This vulnerability is fixed in 26.1.8.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.6, OPNsense's LDAP authentication connector passes the login username directly into an LDAP search filter without calling ldapescape(). An unauthenticated attacker can inject LDAP filter metacharacters into the username field of the WebGUI login page to enumerate valid LDAP usernames in the configured directory. When the LDAP server configuration includes an Extended Query to restrict login to members of a specific group, the same injection can be used to bypass that group membership restriction and authenticate as any LDAP user whose password is known, regardless of group membership. This vulnerability is fixed in 26.1.6.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.4, multiple OPNsense MVC API endpoints perform state‑changing operations but are accessible via HTTP GET requests without CSRF protection. The framework CSRF validation in ApiControllerBase only applies to POST/PUT/DELETE methods, allowing authenticated GET requests to bypass CSRF verification. As a result, a malicious website can trigger privileged backend actions when visited by an authenticated user, causing unintended service reloads and configuration changes through configd. This results in an authenticated Cross‑Site Request Forgery vulnerability allowing unauthorized system state changes. This vulnerability is fixed in 26.1.4.

Insecure permissions exist for configd.socket in OPNsense Community Edition before 23.7 and Business Edition before 23.4.2.

OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 was discovered to contain insecure permissions in the directory /tmp.

Incorrect access control in the WebUI in OPNsense before version 19.1.8, and pfsense before 2.4.4-p3 allows remote authenticated users to escalate privileges to administrator via a specially crafted request.

OPNsense is a FreeBSD based firewall and routing platform. Prior to 26.1.7, a logic flaw in the OPNsense lockouthandler allows an unauthenticated attacker to continuously reset the authentication failure counter for their IP address. By interjecting a crafted username containing a success keyword ("Accepted" or "Successful login") between normal brute-force attempts, an attacker can prevent the failure counter from ever reaching the lockout threshold. This vulnerability is fixed in 26.1.7.

OPNsense 18.7.x before 18.7.7 has Incorrect Access Control.

A Cross-Site Request Forgery (CSRF) in the System Halt API (/system/halt) of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to cause a Denial of Service (DoS) via a crafted GET request.

OPNsense 19.1 contains a stored cross-site scripting vulnerability in the systemadvancedsysctl.php endpoint that allows attackers to inject persistent malicious scripts via the tunable parameter. Attackers can submit POST requests with script payloads that are stored and executed in the context of authenticated user sessions when the page is viewed.

OPNsense 19.1 contains a stored cross-site scripting vulnerability that allows authenticated attackers to inject malicious scripts by submitting crafted input to the category parameter. Attackers can send POST requests to firewallrulesedit.php with script payloads in the category field to execute arbitrary JavaScript in the browsers of other users accessing firewall rule pages.

An open redirect issue was discovered in OPNsense through 20.1.5. The redirect parameter "url" in login page was not filtered and can redirect user to any website.

A Cross-site scripting (XSS) vulnerability was discovered in OPNsense before 21.7.4 via the LDAP attribute return in the authentication tester.

A cross-site scripting (XSS) vulnerability in the act parameter of systemcertmanager.php in OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

A reflected cross-site scripting (XSS) vulnerability in the component /ui/diagnostics/log/core/ of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to inject arbitrary JavaScript via the URL path.

An open redirect in the Login page of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows attackers to redirect a victim user to an arbitrary web site via a crafted URL.

OPNsense before 23.7.5 allows XSS via the index.php sequence parameter to the Lobby Dashboard.

OPNsense before 23.7.5 allows XSS via the index.php columncount parameter to the Lobby Dashboard.

The Crash Reporter (crashreporter.php) component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 mishandles input sanitization.

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows attackers to inject malicious scripts by exploiting the passthroughnetworks parameter in vpnipsecsettings.php. Attackers can craft POST requests with JavaScript payloads in the passthroughnetworks parameter to execute arbitrary code in users' browsers.

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Attackers can send POST requests to the monit interface with JavaScript payloads in the mailserver parameter to execute arbitrary code in users' browsers.