{"schemaVersion":3,"id":"CVE-2026-83628","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The Theme My Login plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 7.1.15 on Multisite installations. This is due to the `tml_ms_signup_handler()` function's `gimmeanotherblog` branch failing to enforce the network's `active_signup` registration policy, checking only `is_user_logged_in()` while sibling branches such as `validate-blog-signup` apply the full policy gate. This makes it possible for authenticated attackers, with Subscriber-level access and above, to directly POST `stage=gimmeanotherblog` to Theme My Login's signup route, bypassing the configured registration policy entirely — even when it is set to `none` or `user` — which causes `wpmu_create_blog()` to execute with the attacker's user ID, after which WordPress core assigns the Administrator role on the newly created subsite via `add_user_to_blog()`. The privilege gain is scoped to the newly created subsite only; the attacker's account retains Subscriber-level access on the main site and does not obtain Super Admin or network-level capabilities such as `manage_network` or `manage_sites`.","dates":{"published":"2026-09-05T05:30:55.158Z","modified":"2026-09-07T11:17:26.627Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"wordfence","score":4.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00394,"percentile":0.32382,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.15400000000000003,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.0024},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00394,"percentile":0.32382}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0024,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00394,"percentile":null},{"date":"2026-10-07T00:00:00.000Z",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