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CVE-2026-83628— Theme My Login <= 7.1.15 - Authenticated (Subscriber+) Missing Authorization to Unauthorized Multisite Subsite Creation via 'gimmeanotherblog' Signup Stage

Quick assessment

Affected
jfarthing84 Theme My Login
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Theme My Login 插件在 Multisite（多站点）安装环境中，版本 7.1.15 及之前版本存在授权缺失（Missing Authorization）漏洞。 该漏洞源于 函数中 分支未能强制执行网络的 注册策略。该分支仅检查 ，而诸如 等兄弟分支则会应用完整的策略门控。 这使得已认证的、拥有订阅者（Subscriber）级别或更高权限的攻击者能够直接向 Theme My Login 的注册路由 POST 参数 ，从而完全绕过已配置的注册策略——即使该策略被设置为 （禁止注册）

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-83628

Vulnerability Information
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Vulnerability Title
Theme My Login <= 7.1.15 - Authenticated (Subscriber+) Missing Authorization to Unauthorized Multisite Subsite Creation via 'gimmeanotherblog' Signup Stage
Source: CVE Program / CVE List V5
Vulnerability 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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jfarthing84 Theme My Login 0 ~ 7.1.15 -

II. Public POCs for CVE-2026-83628

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III. Intelligence Information for CVE-2026-83628

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Other References for CVE-2026-83628 (7)

IV. Related Vulnerabilities

Same product: Theme My Login
Same vendor: jfarthing84
Same weakness: CWE-862

V. Comments for CVE-2026-83628

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