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This issue represents an incomplete fix for a prior vulnerability: the 2.29.0 remediation moved the target email out of POST data into a server-side transient, but because any Subscriber can still overwrite the outbound API URL that populates that transient, the full authentication bypass chain remains exploitable in three AJAX requests."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","description":"CWE-287 Improper Authentication","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-11T11:31:07.020Z","orgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","shortName":"Wordfence"},"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/67b82539-8582-4bb4-ad4c-b626233b6075?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/6storage-rentals/tags/2.31.0/inc/Base/Six_Storage_DashboardController.php#L4126"},{"url":"https://plugins.trac.wordpress.org/browser/6storage-rentals/tags/2.31.0/inc/Pages/Admin/Six_Storage_WpAdmin.php#L708"},{"url":"https://plugins.trac.wordpress.org/browser/6storage-rentals/tags/2.31.0/inc/Base/Six_Storage_SignInControllerSixStorage.php#L90"},{"url":"https://plugins.trac.wordpress.org/browser/6storage-rentals/tags/2.31.0/inc/Pages/Admin/Six_Storage_WpAdmin.php#L39"},{"url":"https://plugins.trac.wordpress.org/browser/6storage-rentals/tags/2.31.0/inc/Base/Six_Storage_DashboardController.php#L14"}],"timeline":[{"lang":"en","time":"2026-11-10T21:44:52.000Z","value":"Disclosed"}],"title":"6Storage Rentals <= 2.31.0 - Authenticated (Subscriber+) Authentication Bypass to Administrator Account Takeover via 'six_storage_online_api_url' Option Poisoning + Transient-Backed Auth Bypass"}},"cveMetadata":{"assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","assignerShortName":"Wordfence","cveId":"CVE-2026-103883","datePublished":"2026-11-11T11:31:07.020Z","dateReserved":"2026-10-01T13:22:11.942Z","dateUpdated":"2026-11-11T11:31:07.020Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-11 12:18:14","lastModifiedDate":"2026-11-11 12:18:14","problem_types":["CWE-287","CWE-287 CWE-287 Improper Authentication"],"metrics":{"cvssMetricV31":[{"source":"security@wordfence.com","type":"Primary","cvssData":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"103883","Ordinal":"1","Title":"6Storage Rentals <= 2.31.0 - Authenticated (Subscriber+) Authent","CVE":"CVE-2026-103883","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"103883","Ordinal":"1","NoteData":"The 6Storage Rentals plugin for WordPress is vulnerable to Authentication Bypass leading to Administrator Account Takeover in all versions up to, and including, 2.31.0. The vulnerability exists because the `six_storage_portal_registration()` AJAX handler — registered on `wp_ajax_six_storage_portal_plugin_registration` — performs no capability check and no nonce verification before writing the caller-supplied `six_storage_online_api_url` POST parameter to the site-wide option of the same name; the unauthenticated `six_storage_create_wp_user()` handler then redeems a transient seeded from that attacker-controlled URL's response and unconditionally calls `wp_set_current_user()` and `wp_set_auth_cookie()` with no ownership or credential verification. This makes it possible for authenticated attackers, with Subscriber-level access and above, to authenticate as any existing WordPress user — including any administrator whose email address is known or guessable — resulting in full site compromise. This issue represents an incomplete fix for a prior vulnerability: the 2.29.0 remediation moved the target email out of POST data into a server-side transient, but because any Subscriber can still overwrite the outbound API URL that populates that transient, the full authentication bypass chain remains exploitable in three AJAX requests.","Type":"Description","Title":"6Storage Rentals <= 2.31.0 - Authenticated (Subscriber+) Authent"}]}}}