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CVE-2026-15407— Themify Builder <= 7.7.7 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Post Stylesheet Write/Delete via tb_generate_on_fly AJAX Action

Quick assessment

Affected
themifyme Themify Builder
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 Themify Builder是WordPress基金会的一款WordPress页面构建插件。 WordPress Themify Builder 7.7.7及之前版本存在授权问题漏洞，该漏洞源于未正确验证用户授权，可能导致经过身份验证的攻击者（具有订阅者级别及以上访问权限）覆盖或删除任意帖子的CSS样式表文件并修改插件范围的字体选项。

CVSS 4.3 · Medium EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
themifyme Themify Builder ≤ 7.7.7 affected
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I. Basic Information for CVE-2026-15407

Vulnerability Information
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Vulnerability Title
Themify Builder <= 7.7.7 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Post Stylesheet Write/Delete via tb_generate_on_fly AJAX Action
Source: CVE Program / CVE List V5
Vulnerability Description
The Themify Builder plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 7.7.7. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite or delete the generated CSS stylesheet file of arbitrary posts, including private and draft posts owned by other users, and modify plugin-scoped font options. The required CSRF nonce (tf_nonce) is emitted on public front-end builder pages via wp_localize_script, making it trivially obtainable by any authenticated user visiting such a page.
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
Vulnerability Title
WordPress Themify Builder 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Themify Builder是WordPress基金会的一款WordPress页面构建插件。 WordPress Themify Builder 7.7.7及之前版本存在授权问题漏洞，该漏洞源于未正确验证用户授权，可能导致经过身份验证的攻击者（具有订阅者级别及以上访问权限）覆盖或删除任意帖子的CSS样式表文件并修改插件范围的字体选项。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
themifyme Themify Builder 0 ~ 7.7.7 -

II. Public POCs for CVE-2026-15407

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III. Intelligence Information for CVE-2026-15407

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Patches & Fixes for CVE-2026-15407 (6)

Vendor Advisories for CVE-2026-15407 (1)

Vendor Pages for CVE-2026-15407 (1)

Other References for CVE-2026-15407 (1)

IV. Related Vulnerabilities

Same product: Themify Builder
Same vendor: themifyme
Same weakness: CWE-862

V. Comments for CVE-2026-15407

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