{"id":"CVE-2026-96561","state":"PUBLISHED","title":"AI Engine <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'model_' Parameter → PHP Error-Log Injection → Advisor Indirect Prompt Injection","description":"The AI Engine – The Chatbot, AI Framework & MCP for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.8.0 This is due to a chain of missing input neutralization and output escaping across the /mwai-ui/v1/chats/submit REST endpoint, the PHP error-log parser (MeowKit_MWAI_Helpers::php_error_logs), the Advisor task (Meow_MWAI_Modules_Advisor::run_advisor), and the Advisor dashboard widget (advisor_metabox): the server-parameter denylist in chat_submit strips only exact key names such as 'model' while convert_keys() later canonicalizes 'model_' back to 'model', allowing an unauthenticated caller to place an attacker-controlled string (including CR/LF) into $query->model; final_checks() throws an Exception whose message embeds that raw string, and the non-streaming, non-admin catch branch writes it to the PHP error log unmodified — creating a forged log line that the plugin's own parser subsequently returns as recent PHP-error content; run_advisor() then appends that content verbatim to the AI prompt (indirect prompt injection — CWE-1427), the returned JSON is stored in the mwai_advisor_data option with no schema validation or HTML sanitization, and advisor_metabox() concatenates the resulting 'title' and 'description' values directly into the WordPress dashboard widget without esc_html(), wp_kses(), or equivalent escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever an administrator accesses the WordPress dashboard.","publishedAt":"2026-10-01T03:28:22.465Z","updatedAt":"2026-10-01T14:18:02.665Z","severity":{"score":7.2,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","source":"Wordfence"},"assigner":"Wordfence","products":["tigroumeow AI Engine – The Chatbot, AI Framework & MCP for WordPress"],"affected":[{"vendor":"tigroumeow","product":"AI Engine – The Chatbot, AI Framework & MCP for WordPress","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"3.8.0","versionType":"semver"}]}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/910e51da-6ee2-45d5-837b-7fea80f79390?source=cve","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/modules/advisor.php#L216","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/modules/advisor.php#L162","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/modules/advisor.php#L156","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/common/helpers.php#L251","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/modules/chatbot.php#L299","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/engines/core.php#L533","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/query/base.php#L360","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/modules/chatbot.php#L597","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/rest.php#L464","https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.0/classes/modules/chatbot.php#L122","https://plugins.trac.wordpress.org/changeset?old_path=%2Fai-engine%2Ftags%2F3.8.0&new_path=%2Fai-engine%2Ftags%2F3.8.1"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/96xxx/CVE-2026-96561.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-96561","state":"PUBLISHED","datePublished":"2026-10-01T03:28:22.465Z","dateUpdated":"2026-10-01T14:18:02.665Z","assignerShortName":"Wordfence","assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateReserved":"2026-09-23T13:16:53.044Z"},"containers":{"cna":{"title":"AI Engine <= 3.8.0 - Unauthenticated Stored Cross-Site Scripting via 'model_' Parameter → PHP Error-Log Injection → Advisor Indirect Prompt Injection","descriptions":[{"lang":"en","value":"The AI Engine – The Chatbot, AI Framework & MCP for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.8.0 This is due to a chain of missing input neutralization and output escaping across the /mwai-ui/v1/chats/submit REST endpoint, the PHP error-log parser (MeowKit_MWAI_Helpers::php_error_logs), the Advisor task (Meow_MWAI_Modules_Advisor::run_advisor), and the Advisor dashboard widget (advisor_metabox): the server-parameter denylist in chat_submit strips only exact key names such as 'model' while convert_keys() later canonicalizes 'model_' back to 'model', allowing an unauthenticated caller to place an attacker-controlled string (including CR/LF) into $query->model; final_checks() throws an Exception whose message embeds that raw string, and the non-streaming, non-admin catch branch writes it to the PHP error log unmodified — creating a forged log line that the plugin's own parser subsequently returns as recent PHP-error content; run_advisor() then appends that content verbatim to the AI prompt (indirect prompt injection — CWE-1427), the returned JSON is stored in the mwai_advisor_data option with no schema validation or HTML sanitization, and advisor_metabox() concatenates the resulting 'title' and 'description' values directly into the WordPress dashboard widget without esc_html(), wp_kses(), or equivalent escaping. 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