EUVD-2026-71840
GHSA-6vjm-3j93-7v9p
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Subscriber-level authentication is a hard prerequisite (PR:L); integrity impact is limited to unauthorized subsite creation scoped to new subsite only (I:L); Multisite-only constraint does not raise AC since no special race or configuration window is required beyond Multisite being active.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Theme My Login plugin for WordPress (≤7.1.15) on Multisite installations allows authenticated Subscriber-level accounts to bypass the network's active_signup registration policy by posting directly to the gimmeanotherblog handler, which omits the policy gate enforced by sibling branches and unconditionally invokes wpmu_create_blog() with the attacker's user ID. WordPress core then assigns the Administrator role on the resulting subsite, granting full subsite control - including plugin and theme installation - to an otherwise low-privileged user. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session with at least Subscriber-level access on the main site of a WordPress Multisite network running Theme My Login 7.1.15 or earlier. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N) accurately captures the constrained blast radius: the attacker must already hold a Subscriber account, and the resulting Administrator role is scoped to a newly created subsite only - not the main site, not Super Admin, and not network-level capabilities like `manage_network` or `manage_sites`. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update Theme My Login to version 7.2.0, which contains the authorization fix as confirmed by the SVN changeset at https://plugins.trac.wordpress.org/changeset?reponame=&new=3669722%40theme-my-login%2Ftags%2F7.2.0&old=3643898%40theme-my-login%2Ftags%2F7.1.15 and the trunk patch at https://plugins.trac.wordpress.org/changeset/3669721/theme-my-login/trunk/includes/ms-functions.php. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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