CVE-2026-48836: WordPress Easy Invoice plugin <= 2.1.19 - Remote Code Execution (RCE) vulnerability

Synopsis

An unauthenticated remote code execution vulnerability affects the Easy Invoice WordPress plugin at version 2.1.19 and earlier. The flaw is reachable over the network and requires no login or user interaction, meaning any attacker who can send HTTP requests to a site running the plugin can exploit it. Successful exploitation gives the attacker full code execution on the underlying server, with complete access to confidentiality, integrity, and availability of the host. No fix version has been published yet; HarborGuard tracks the advisory and will make a patched-image rebuild available as soon as upstream ships a patch.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The attacker must be able to send HTTP requests to the target WordPress site over the network; no local or adjacent-network access is required.

• AuthenticationNot required

  No account or credentials of any kind are needed; the vulnerable endpoint is accessible to anonymous requests.

• Victim interactionNot required

  No user action is required; the attacker exploits the vulnerability entirely without any interaction from a logged-in user or site visitor.

• Attack complexityDetail

  Exploitation is reliable and condition-free, with no race conditions, specific memory layouts, or environmental preconditions the attacker must arrange.

Blast Radius

• A successful attacker executes arbitrary code in the context of the web server process, effectively controlling the server.
• Confidentiality is fully compromised: the attacker reads files, environment variables, database credentials, and any customer data stored on the host.
• Integrity is fully compromised: the attacker writes, modifies, or deletes files, injects backdoors, and alters database content.
• Availability is fully compromised: the attacker crashes or terminates the web server process or exhausts host resources, taking the site offline.