{"id":"CVE-2026-2839","revision":null,"records":[{"revision":"1ae6cc586e6145e681d39255970a6fed","observedAt":"2026-10-29T03:25:09.193+00:00","statement":{"source":"cve-program","id":"CVE-2026-2839","aliases":[],"title":"Advanced Custom Fields: Extended <= 0.9.2.7 - Missing Authorization to Unauthenticated Data Exposure via Multiple AJAX Endpoints","description":"The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to unauthorized access of data and triggering of server-side actions in all versions up to, and including, 0.9.2.7. This is due to multiple AJAX handlers registered for unauthenticated users (`wp_ajax_nopriv_*`) that fail to implement proper `current_user_can()` authorization checks. While these handlers use ACF's `acf_verify_ajax()` function to validate cryptographic nonces, the `acf_nonce` values are generated for guest users and publicly exposed in the page source of any frontend page utilizing an ACF form. This makes it possible for unauthenticated attackers to extract the guest nonce and bypass WordPress visibility permissions, leading to the unauthorized disclosure of post titles and internal Flexible Content layout structures. The vulnerability was partially patched in version 0.9.2.4.","state":0,"publishedAt":"2026-10-28T06:45:17.566+00:00","modifiedAt":"2026-10-29T01:41:51.846+00:00","affected":[{"ecosystem":"Vendor product","name":"Advanced Custom Fields: Extended","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"hwk-fr\",\n                    \"product\": \"Advanced Custom Fields: Extended\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"lessThanOrEqual\": \"0.9.2.7\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/9954ef37-bae0-48fb-9654-ff54750c46c2?source=cve","https://plugins.trac.wordpress.org/browser/acf-extended/trunk/includes/fields/field-advanced-link.php#L25","https://plugins.trac.wordpress.org/browser/acf-extended/trunk/includes/fields/field-advanced-link.php#L603","https://plugins.trac.wordpress.org/browser/acf-extended/trunk/includes/fields/field-flexible-content-async.php#L24","https://plugins.trac.wordpress.org/browser/acf-extended/trunk/includes/fields/field-flexible-content-async.php#L151","https://plugins.trac.wordpress.org/changeset/3516027/","https://plugins.trac.wordpress.org/changeset/3754818/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-2839","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-2839","identifiers":["CVE-2026-2839"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-a62e0f5120334284beb3f9889cd2a2da","complete":true,"records":13631,"lastAttemptAt":"2026-11-07T08:37:59.5911353+00:00","lastSuccessAt":"2026-11-07T08:37:59.587+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:37:59.587+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-07T08:26:54.7587124+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T08:26:54.7587124+00:00","lastSuccessAt":"2026-11-07T08:26:54.9369587+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.9369591+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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