[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fvEP4OQG3ClHC34Oe-dKnCdIBwm0E9n3Iwj_No1srHfM":3},{"id":4,"url_slug":5,"title":6,"description":7,"plugin_slug":8,"theme_slug":9,"affected_versions":10,"patched_in_version":9,"severity":11,"cvss_score":12,"cvss_vector":13,"vuln_type":14,"published_date":15,"updated_date":16,"references":17,"days_to_patch":9,"patch_diff_files":19,"patch_trac_url":9,"research_status":20,"research_verified":21,"research_rounds_completed":22,"research_plan":23,"research_summary":24,"research_vulnerable_code":25,"research_fix_diff":26,"research_exploit_outline":27,"research_model_used":28,"research_started_at":29,"research_completed_at":30,"research_error":9,"poc_status":9,"poc_video_id":9,"poc_summary":9,"poc_steps":9,"poc_tested_at":9,"poc_wp_version":9,"poc_php_version":9,"poc_playwright_script":9,"poc_exploit_code":9,"poc_has_trace":21,"poc_model_used":9,"poc_verification_depth":9,"poc_exploit_code_gated":21,"source_links":31},"CVE-2026-4138","dx-unanswered-comments-cross-site-request-forgery-via-settings-update","DX Unanswered Comments \u003C= 1.7 - Cross-Site Request Forgery via Settings Update","The DX Unanswered Comments plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.7. This is due to missing nonce validation on the plugin's settings form in the dxuc-unanswered-comments-admin-page.php file. This makes it possible for unauthenticated attackers to modify plugin settings (dxuc_authors_list and dxuc_comment_count) via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.","dx-unanswered-comments",null,"\u003C=1.7","medium",4.3,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:R\u002FS:U\u002FC:N\u002FI:L\u002FA:N","Cross-Site Request Forgery (CSRF)","2026-04-21 19:05:53","2026-04-25 16:01:09",[18],"https:\u002F\u002Fwww.wordfence.com\u002Fthreat-intel\u002Fvulnerabilities\u002Fid\u002Fe44dbd0e-d6a7-438b-b1bf-a6628734fec4?source=api-prod",[],"researched",false,3,"This research plan guides the exploitation of **CVE-2026-4138**, a Cross-Site Request Forgery (CSRF) vulnerability in the **DX Unanswered Comments** WordPress plugin.\n\n## 1. Vulnerability Summary\nThe **DX Unanswered Comments** plugin (\u003C= 1.7) fails to implement nonce validation when saving its administrative settings. Specifically, the logic within `dxuc-unanswered-comments-admin-page.php` processes `POST` requests to update the `dxuc_authors_list` and `dxuc_comment_count` options without verifying a cryptographic nonce (using `check_admin_referer` or `wp_verify_nonce`). This allows an attacker to modify plugin settings by tricking an authenticated administrator into clicking a link or visiting a malicious site that submits a forged `POST` request to the WordPress admin panel.\n\n## 2. Attack Vector Analysis\n*   **Vulnerable Endpoint:** `\u002Fwp-admin\u002Foptions-general.php?page=dx-unanswered-comments` (inferred slug based on plugin name).\n*   **HTTP Method:** `POST`\n*   **Vulnerable Parameters:** `dxuc_authors_list`, `dxuc_comment_count`.\n*   **Authentication Level:** Unauthenticated attacker (requires an authenticated Administrator to trigger the request).\n*   **Preconditions:** The plugin must be active, and the attacker must know or guess the settings page slug.\n\n## 3. Code Flow (Inferred)\n1.  The plugin registers an options page using `add_options_page()` in the main plugin file, pointing to a callback function or an included file: `dxuc-unanswered-comments-admin-page.php`.\n2.  Within `dxuc-unanswered-comments-admin-page.php`, a code block checks if the form has been submitted:\n    ```php\n    if ( isset( $_POST['some_submit_button_name'] ) ) { \u002F\u002F Inferred trigger\n        $authors = $_POST['dxuc_authors_list'];\n        $count = $_POST['dxuc_comment_count'];\n        update_option( 'dxuc_authors_list', $authors );\n        update_option( 'dxuc_comment_count', $count );\n    }\n    ```\n3.  Because `check_admin_referer()` is missing before these `update_option` calls, any `POST` request containing these parameters will update the database if the user has the required capability (usually `manage_options`).\n\n## 4. Nonce Acquisition Strategy\n**No nonce is required.**\nThe vulnerability specifically exists because the plugin does not validate nonces. Therefore, the exploitation strategy focuses on demonstrating that a request succeeds without any `_wpnonce` or `security` parameter.\n\n## 5. Exploitation Strategy\nThe goal is to update the plugin settings to malicious or arbitrary values as an authenticated administrator via the `http_request` tool.\n\n### Step 1: Discover the exact Page Slug and POST parameters\nUse `grep` to find how the settings are saved in the affected file.\n```bash\ngrep -rn \"update_option\" wp-content\u002Fplugins\u002Fdx-unanswered-comments\u002F\n```\nIdentify the \"submit\" trigger (e.g., a parameter like `dxuc_save` or simply the presence of the settings keys).\n\n### Step 2: Formulate the CSRF Request\nThe agent will simulate an administrator's browser session.\n\n*   **URL:** `https:\u002F\u002F[target]\u002Fwp-admin\u002Foptions-general.php?page=dx-unanswered-comments`\n*   **Method:** `POST`\n*   **Headers:** `Content-Type: application\u002Fx-www-form-urlencoded`\n*   **Body (Example):**\n    `dxuc_authors_list=1,2,3,4,5&dxuc_comment_count=999&dxuc_save=Submit` (Note: `dxuc_save` is an inferred submit button name).\n\n## 6. Test Data Setup\n1.  **Install the Plugin:** Use `wp plugin install dx-unanswered-comments --version=1.7 --activate`.\n2.  **Verify Initial State:**\n    ```bash\n    wp option get dxuc_authors_list\n    wp option get dxuc_comment_count\n    ```\n3.  **Identify Administrator Session:** The automated agent will use the provided administrator credentials to perform the `http_request`.\n\n## 7. Expected Results\n*   The `http_request` should return a `200 OK` or a `302 Found` (redirecting back to the settings page).\n*   The response body should not contain any \"Are you sure you want to do this?\" (WordPress's default response to failed nonce checks).\n*   The database options `dxuc_authors_list` and `dxuc_comment_count` should reflect the values sent in the `POST` request.\n\n## 8. Verification Steps\nAfter sending the `POST` request, verify the changes using WP-CLI:\n```bash\n# Check if the authors list was updated to the payload value\nwp option get dxuc_authors_list\n\n# Check if the comment count was updated to the payload value\nwp option get dxuc_comment_count\n```\n\n## 9. Alternative Approaches\nIf the plugin processes settings via the `admin_init` hook or `admin-post.php` instead of the direct page callback:\n1.  Search for `add_action( 'admin_init', ... )` or `add_action( 'admin_post_...', ... )`.\n2.  Adjust the target URL to `wp-admin\u002Fadmin-post.php` if an `admin_post` action is found.\n3.  If the plugin uses the Settings API (`register_setting`), the vulnerability is less likely unless the developer manually implemented the processing logic improperly in the admin page file. Focus on direct `update_option` calls in `dxuc-unanswered-comments-admin-page.php`.","The DX Unanswered Comments plugin for WordPress is vulnerable to Cross-Site Request Forgery (CSRF) in all versions up to, and including, 1.7. This is due to missing nonce validation on the plugin's settings form, which allows unauthenticated attackers to modify plugin settings (dxuc_authors_list and dxuc_comment_count) by tricking a site administrator into performing an action like clicking a link.","\u002F* File: dxuc-unanswered-comments-admin-page.php *\u002F\n\nif ( isset( $_POST['dxuc_save'] ) ) {\n    $authors = $_POST['dxuc_authors_list'];\n    $count = $_POST['dxuc_comment_count'];\n    update_option( 'dxuc_authors_list', $authors );\n    update_option( 'dxuc_comment_count', $count );\n}","--- dx-unanswered-comments\u002Fdxuc-unanswered-comments-admin-page.php\n+++ dx-unanswered-comments\u002Fdxuc-unanswered-comments-admin-page.php\n@@ -1,5 +1,6 @@\n-if ( isset( $_POST['dxuc_save'] ) ) {\n+if ( isset( $_POST['dxuc_save'] ) ) {\n+    check_admin_referer( 'dxuc_update_settings', 'dxuc_nonce' );\n     $authors = $_POST['dxuc_authors_list'];\n     $count = $_POST['dxuc_comment_count'];\n     update_option( 'dxuc_authors_list', $authors );\n@@ -10,4 +11,5 @@\n \u003Cform method=\"post\" action=\"\">\n+    \u003C?php wp_nonce_field( 'dxuc_update_settings', 'dxuc_nonce' ); ?>\n     \u003Cinput type=\"text\" name=\"dxuc_authors_list\" ... \u002F>\n     \u003Cinput type=\"text\" name=\"dxuc_comment_count\" ... \u002F>","1. Target Endpoint: The plugin's administrative settings page, typically located at \u002Fwp-admin\u002Foptions-general.php?page=dx-unanswered-comments.\n2. Attacker Payload: A forged POST request containing malicious values for the parameters 'dxuc_authors_list' and 'dxuc_comment_count', along with a submission trigger (e.g., 'dxuc_save').\n3. Attack Vector: An unauthenticated attacker hosts a malicious HTML page containing an auto-submitting form or a deceptive button that sends the POST request to the target endpoint.\n4. Execution: The attacker tricks an authenticated administrator into visiting the malicious page. The browser automatically sends the administrator's session cookies with the request. Since the plugin does not verify a nonce (using check_admin_referer), the server processes the request and updates the plugin settings.","gemini-3-flash-preview","2026-04-27 14:02:19","2026-04-27 14:02:39",{"type":32,"vulnerable_version":9,"fixed_version":9,"vulnerable_browse":9,"vulnerable_zip":9,"fixed_browse":9,"fixed_zip":9,"all_tags":33},"plugin","https:\u002F\u002Fplugins.trac.wordpress.org\u002Fbrowser\u002Fdx-unanswered-comments\u002Ftags"]