Description

Editor Remote Code Execution (RCE) in Tabs <= 2.5 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.0",
  "pubDate": "2026-10-06T09:17:50.347Z",
  "pubdate": "2026-10-06T09:17:50.347Z",
  "executiveSummary": "The Tabs plugin for WordPress, in versions <= 2.5, is susceptible to a critical Remote Code Execution (RCE) vulnerability. This vulnerability arises due to improper input validation and sanitization within the plugin's file handling or configuration processing mechanisms. The security flaw permits unauthenticated or authenticated attackers with sufficient privileges to inject and execute arbitrary server-side code within the WordPress environment. Successful exploitation of this vulnerability leads to a complete compromise of the affected web application. An attacker can gain unauthorized access to the underlying server, execute arbitrary system commands, steal sensitive database information, modify or delete website content, or establish persistence via backdoors. Given the nature of RCE, the risk is classified as critical, requiring immediate attention. The exploitation does not necessarily require complex environmental conditions, making it an attractive target for automated scanning and manual exploitation attempts by malicious actors aiming to achieve full server-level control.",
  "technicalDetails": "The vulnerability in Tabs <= 2.5 stems from the insecure handling of user-supplied data, likely within functions responsible for saving plugin settings or processing file uploads/attachments related to tab content. The root cause is the lack of strict server-side validation or effective sanitization of input before it is passed to a sink that executes code or interprets file paths as executable instructions.\nThe attack flow typically involves an adversary interacting with the vulnerable administrative endpoints or front-end input fields provided by the Tabs plugin. If the plugin fails to implement proper nonce verification or access control checks, an attacker can manipulate parameters to inject malicious PHP code or path traversal sequences. By crafting a payload that leverages inadequate file type validation, an attacker may upload a malicious script—disguised as a legitimate file—into a directory accessible by the web server. Once the malicious payload is persisted on the filesystem, the attacker triggers its execution by sending a direct HTTP request to the file path, causing the web server's PHP interpreter to execute the injected instructions.\nAlternatively, if the vulnerability exists in a configuration saving function, the attacker might inject serialized objects or raw PHP code directly into the WordPress options table or plugin settings. If this data is later unserialized or dynamically evaluated by the application, the malicious payload is executed in the context of the web server process. The privilege requirements depend on the specific entry point; if the vulnerable code is reachable by unauthorized users, no authentication is required. If the vulnerability resides in an administrative panel, the attacker must have at least low-level administrative or editor-level access, depending on the plugin's capabilities. Post-exploitation, the attacker operates with the same permissions as the web server user (e.g., www-data), facilitating lateral movement within the hosting environment, the installation of web shells for persistent remote access, and potential exfiltration of configuration files containing database credentials or API keys."
}