{"id":"CVE-2026-109216","state":"PUBLISHED","title":"Meta Box <= 5.15.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Background Field Array Keys","description":"The Meta Box – A Framework for Dynamic Websites plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'profile_background[<attacker-chosen key>]' parameter in all versions up to, and including, 5.15.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitability depends on a consuming plugin or theme built on Meta Box that exposes the background field to lower-privileged users and renders stored values via the rwmb_the_value()/format_single_value() pattern; the effective minimum privilege is whatever role that consumer permits, demonstrated at Subscriber level.","publishedAt":"2026-10-29T11:27:14.853Z","updatedAt":"2026-10-29T12:36:51.108Z","severity":{"score":4.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","source":"Wordfence"},"assigner":"Wordfence","products":["metabox Meta Box – A Framework for Dynamic Websites"],"affected":[{"vendor":"metabox","product":"Meta Box – A Framework for Dynamic Websites","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"5.15.2","versionType":"semver"}]}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/7a8948f5-8bcf-48f2-b3a6-bfa24ba9bef0?source=cve","https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/fields/background.php#L154","https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/sanitizer.php#L170","https://github.com/wpmetabox/meta-box/pull/1709","https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.3/inc/fields/background.php"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/109xxx/CVE-2026-109216.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109216","state":"PUBLISHED","datePublished":"2026-10-29T11:27:14.853Z","dateUpdated":"2026-10-29T12:36:51.108Z","assignerShortName":"Wordfence","assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateReserved":"2026-10-12T13:39:09.653Z"},"containers":{"cna":{"title":"Meta Box <= 5.15.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Background Field Array Keys","descriptions":[{"lang":"en","value":"The Meta Box – A Framework for Dynamic Websites plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'profile_background[<attacker-chosen key>]' parameter in all versions up to, and including, 5.15.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitability depends on a consuming plugin or theme built on Meta Box that exposes the background field to lower-privileged users and renders stored values via the rwmb_the_value()/format_single_value() pattern; the effective minimum privilege is whatever role that consumer permits, demonstrated at Subscriber level."}],"affected":[{"vendor":"metabox","product":"Meta Box – A Framework for Dynamic Websites","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"5.15.2","versionType":"semver"}]}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/7a8948f5-8bcf-48f2-b3a6-bfa24ba9bef0?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/fields/background.php#L154"},{"url":"https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/sanitizer.php#L170"},{"url":"https://github.com/wpmetabox/meta-box/pull/1709"},{"url":"https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.3/inc/fields/background.php"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","baseScore":4.9,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79 Improper Neutralization of Input During Web Page Generation","type":"CWE"}]}],"providerMetadata":{"shortName":"Wordfence","orgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateUpdated":"2026-10-29T11:27:14.853Z"},"credits":[{"lang":"en","type":"finder","value":"Md. Moniruzzaman Prodhan (NomanProdhan)"}],"timeline":[{"time":"2026-10-12T13:54:39.000Z","lang":"en","value":"Vendor Notified"},{"time":"2026-10-28T21:31:51.000Z","lang":"en","value":"Disclosed"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-109216","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-29T12:17:36.454458Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T12:36:51.108Z"}}]}}}