{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-8365", "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "state": "PUBLISHED", "assignerShortName": "Wordfence", "dateReserved": "2026-05-11T19:25:24.123Z", "datePublished": "2026-06-09T08:29:40.638Z", "dateUpdated": "2026-06-09T08:29:40.638Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599", "shortName": "Wordfence", "dateUpdated": "2026-06-09T08:29:40.638Z"}, "affected": [{"vendor": "creativethemeshq", "product": "Blocksy", "versions": [{"version": "0", "status": "affected", "lessThanOrEqual": "2.1.41", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func()."}], "title": "Blocksy <= 2.1.41 - Authenticated (Contributor+) PHP Object Injection via Deserialization of Untrusted Data via 'blocksy_meta' REST API Field", "references": [{"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/fd216743-ce8d-4632-9fd1-d63502c2dfcd?source=cve"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/db-versioning/utils/db-search-replacer.php#L98"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/db-versioning/utils/db-search-replacer.php#L98"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/meta-boxes.php#L104"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/meta-boxes.php#L104"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/validator.php#L75"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/validator.php#L75"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/raii.php#L12"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/raii.php#L12"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/db-versioning/utils/db-search-replacer.php#L98"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/meta-boxes.php#L104"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/validator.php#L75"}, {"url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/raii.php#L12"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-502 Deserialization of Untrusted Data", "cweId": "CWE-502", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}}], "credits": [{"lang": "en", "type": "finder", "value": "Qu\u1ed1c Huy"}], "timeline": [{"time": "2026-05-12T06:30:57.000Z", "lang": "en", "value": "Vendor Notified"}, {"time": "2026-06-08T20:11:29.000Z", "lang": "en", "value": "Disclosed"}]}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func()."}], "id": "CVE-2026-8365", "lastModified": "2026-06-09T09:16:31.013", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security@wordfence.com", "type": "Primary"}]}, "published": "2026-06-09T09:16:31.013", "references": [{"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/meta-boxes.php#L104"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/validator.php#L75"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/db-versioning/utils/db-search-replacer.php#L98"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/raii.php#L12"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/meta-boxes.php#L104"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/validator.php#L75"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/db-versioning/utils/db-search-replacer.php#L98"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/raii.php#L12"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/meta-boxes.php#L104"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/validator.php#L75"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/db-versioning/utils/db-search-replacer.php#L98"}, {"source": "security@wordfence.com", "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/raii.php#L12"}, {"source": "security@wordfence.com", "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/fd216743-ce8d-4632-9fd1-d63502c2dfcd?source=cve"}], "sourceIdentifier": "security@wordfence.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "security@wordfence.com", "type": "Primary"}]}

{}

{"created": "2026-06-09T09:30:36.020909+00:00", "updated": "2026-06-09T09:30:36.020922+00:00", "vendors": []}