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CVE-2026-103883— 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

Quick assessment

Affected
sixstorage 6Storage Rentals
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 6Storage Rentals 插件在所有 2.31.0 及更早版本中存在身份验证绕过漏洞，可导致管理员账户被接管。该漏洞源于 AJAX 处理器（注册在 钩子上）在将调用者提供的 POST 参数写入同名的站点级选项时，未执行任何权限检查，也未进行 nonce 验证。随后，未经验证的 处理器会从由该攻击者控制的 URL 响应中获取并兑现一个临时缓存（transient），并在未进行任何所有权或凭证验证的情况下，无条件调用 和 。这使得拥有订阅者（Subscriber）及以上权限的已认证攻击者

CVSS 8.8 · High
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I. Basic Information for CVE-2026-103883

Vulnerability Information
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Vulnerability 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
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sixstorage 6Storage Rentals 0 ~ 2.31.0 -

II. Public POCs for CVE-2026-103883

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III. Intelligence Information for CVE-2026-103883

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Other References for CVE-2026-103883 (6)

IV. Related Vulnerabilities

Same product: 6Storage Rentals
Same vendor: sixstorage
Same weakness: CWE-287