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CVE-2026-12561— tagDiv Composer <= 5.4.5 - Authenticated (Contributor+) Stored Cross-Site Scripting

Quick assessment

Affected
tagDiv tagDiv Composer
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.

tagDiv Composer是tagDiv公司的一个网页内容编辑工具。 tagDiv Composer 5.4.5及之前版本存在跨站脚本漏洞，该漏洞源于vc_raw_html::render()方法对输入清理和输出转义不足，将base64解码后的shortcode内容直接拼接到页面HTML，可能导致经过身份验证且具有贡献者及以上权限的攻击者注入任意Web脚本。

CVSS 6.4 · Medium EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
tagDiv tagDiv Composer ≤ 5.4.5 affected
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I. Basic Information for CVE-2026-12561

Vulnerability Information
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Vulnerability Title
tagDiv Composer <= 5.4.5 - Authenticated (Contributor+) Stored Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
The tagDiv Composer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the vc_raw_html shortcode in all versions up to and including 5.4.5. This is due to insufficient input sanitization and output escaping in the vc_raw_html::render() method, which base64-decodes shortcode content (after a strip_tags() that is bypassed because the encoded payload contains no tags on save) and concatenates the result directly into the page HTML. Because WordPress's save-time wp_kses_post() filter only sees the inert base64 text inside a normal shortcode bracket and does not decode it, the dangerous tags survive into post_content and are emitted unescaped at render time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page (for example, when an Editor or Administrator previews the pending post).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
tagDiv Composer 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tagDiv Composer是tagDiv公司的一个网页内容编辑工具。 tagDiv Composer 5.4.5及之前版本存在跨站脚本漏洞，该漏洞源于vc_raw_html::render()方法对输入清理和输出转义不足，将base64解码后的shortcode内容直接拼接到页面HTML，可能导致经过身份验证且具有贡献者及以上权限的攻击者注入任意Web脚本。
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
tagDiv tagDiv Composer 0 ~ 5.4.5 -

II. Public POCs for CVE-2026-12561

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III. Intelligence Information for CVE-2026-12561

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Vendor Advisories for CVE-2026-12561 (1)

Security Blog Posts for CVE-2026-12561 (1)

IV. Related Vulnerabilities

Same product: tagDiv Composer
Same vendor: tagDiv
Same weakness: CWE-79

V. Comments for CVE-2026-12561

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