{"id":"CVE-2026-93900","kind":"vulnerability","aliases":["CVE-2026-93900"],"related":[],"title":"WordPress Simple CAPTCHA Turnstile plugin: stored cross-site scripting via shortcode","description":"The Simple CAPTCHA with Cloudflare Turnstile plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' attribute of the [gravity-simple-turnstile] shortcode in versions up to, and including, 1.44.3 This is due to insufficient input sanitization and output escaping on the shortcode attribute in the cfturnstile_gravity_shortcode() function: the value is filtered only by esc_html() and sanitize_text_field() (neither of which touches parentheses or dots) and then emitted via esc_js() in a raw JavaScript expression context outside any string literal (esc_js only escapes quotes, backslashes, and newlines). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.","summary":"The Simple CAPTCHA with Cloudflare Turnstile WordPress plugin up to version 1.44.3 does not sanitize the id attribute of its gravity-simple-turnstile shortcode correctly. An authenticated contributor can store a script in a page that runs in the browser of any visitor who opens it.","severity":"medium","cvss":6.4,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","wordpress","wordpress-plugin"],"not_affected_if":["plugin-newer-than-1.44.3","plugin-not-installed","shortcode-unused"],"how_to_check":"- Check whether the plugin is installed and its version, for example in the WordPress admin under Plugins, or with `wp plugin get <plugin-slug> --field=version` if WP-CLI is used.\n- Search post and page content for the `[gravity-simple-turnstile` shortcode with an unusual id attribute.","fix":"- Plugin version later than `1.44.3` (the sources do not name the exact fixed release).","status":"open","published_at":"2026-11-04T10:17:26+00:00","first_seen_at":"2026-11-04T10:26:34+00:00","triaged_at":"2026-11-04T10:27:16+00:00","updated_at":"2026-11-04T10:27:16+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-11-04T10:27:16Z","model":"claude-haiku-5-5","output":{"fix":"- Plugin version later than `1.44.3` (the sources do not name the exact fixed release).","reach":"internet","title":"WordPress Simple CAPTCHA Turnstile plugin: stored cross-site scripting via shortcode","impact":"medium","summary":"The Simple CAPTCHA with Cloudflare Turnstile WordPress plugin up to version 1.44.3 does not sanitize the id attribute of its gravity-simple-turnstile shortcode correctly. An authenticated contributor can store a script in a page that runs in the browser of any visitor who opens it.","audience":"businesses","category":"package","nicknames":[],"who_cares":["wordpress","wordpress-plugin","self-hosted"],"confidence":0.8,"fix_status":"unknown","needs_auth":"yes","worst_case":"Scripts run in visitors' browsers, enabling session theft or defacement.","analyst_note":"","how_to_check":"- Check whether the plugin is installed and its version, for example in the WordPress admin under Plugins, or with `wp plugin get <plugin-slug> --field=version` if WP-CLI is used.\n- Search post and page content for the `[gravity-simple-turnstile` shortcode with an unusual id attribute.","plain_action":"","needs_analyst":false,"not_affected_if":["plugin-not-installed","shortcode-unused","plugin-newer-than-1.44.3"],"who_is_affected":"Sites running the Simple CAPTCHA with Cloudflare Turnstile plugin version 1.44.3 or older that use the gravity-simple-turnstile shortcode. Exposure needs a contributor-level or higher account, and the risk is highest on sites where untrusted users can write content. Sites without the plugin or without this shortcode can skip it.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000759,"input_tokens":4330,"output_tokens":652,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-2026':14A,17A '-93900':15A,18A '1.44.3':38B,107C 'access':182C,198C 'arbitrari':187C 'attack':177C 'attribut':44B,93C,121C 'authent':54B,176C 'backslash':168C 'browser':67B 'captcha':3A,29B,75C 'cfturnstil':124C 'cloudflar':31B,77C 'context':158C 'contributor':55B,180C 'contributor-level':179C 'correct':52B 'cross':8A,87C 'cross-sit':7A,86C 'cve':13A,16A 'dot':146C 'due':110C 'emit':149C 'esc':134C,151C,163C 'escap':117C,166C 'execut':194C 'express':157C 'field':139C 'filter':131C 'function':127C 'graviti':48B,97C,125C 'gravity-simple-turnstil':47B,96C 'host':22B 'html':135C 'id':43B,92C 'includ':106C 'inject':186C,200C 'input':113C 'insuffici':112C 'javascript':156C 'js':152C,164C 'level':181C 'liter':162C 'make':172C 'neither':140C 'newlin':170C 'open':72B 'output':116C 'outsid':159C 'packag':19B 'page':62B,191C,201C 'parenthes':144C 'plugin':5A,26B,34B,79C 'possibl':174C 'quot':167C 'raw':155C 'run':64B 'sanit':41B,114C,137C 'script':10A,59B,89C,189C 'self':21B 'self-host':20B 'shortcod':12A,51B,100C,120C,126C 'simpl':2A,28B,49B,74C,98C 'site':9A,88C 'store':6A,57B,85C 'string':161C 'text':138C 'touch':143C 'turnstil':4A,32B,50B,78C,99C 'user':197C 'valu':129C 'version':37B,102C 'via':11A,90C,150C 'visitor':70B 'vulner':83C 'web':188C 'whenev':195C 'wordpress':1A,23B,25B,33B,81C 'wordpress-plugin':24B","nicknames":[],"mitigations":[],"who_affected":"Sites running the Simple CAPTCHA with Cloudflare Turnstile plugin version 1.44.3 or older that use the gravity-simple-turnstile shortcode. Exposure needs a contributor-level or higher account, and the risk is highest on sites where untrusted users can write content. Sites without the plugin or without this shortcode can skip it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","package","selfhosted","wordpress","wordpressplugin"],"campaign_type":null,"first_public_at":"2026-11-04T10:17:26+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","cvss_by":"security@wordfence.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-93900","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93900","severity":null,"published_at":"2026-11-04T10:17:26+00:00","modified_at":"2026-11-04T10:17:26+00:00","first_seen_at":"2026-11-04T10:26:34+00:00","fetched_at":"2026-11-04T10:26:34+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}