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CVE-2026-12900— Spectra Gutenberg Blocks <= 2.19.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via uagb/image Block

Quick assessment

Affected
brainstormforce Spectra Legacy – Gutenberg Blocks
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 Spectra Legacy是WordPress基金会的一个CMS组件。 WordPress Spectra Legacy 2.19.28及之前版本存在跨站脚本漏洞，该漏洞源于对输入清理和输出转义不足，可能导致经过身份验证的攻击者（具有Contributor级别及以上权限）通过 区块注入存储型跨站脚本，当用户访问被注入的页面时执行任意Web脚本。

CVSS 6.4 · Medium EPSS 0.32% · P25

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
brainstormforce Spectra Legacy – Gutenberg Blocks ≤ 2.19.28 affected
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I. Basic Information for CVE-2026-12900

Vulnerability Information
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Vulnerability Title
Spectra Gutenberg Blocks <= 2.19.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via uagb/image Block
Source: CVE Program / CVE List V5
Vulnerability Description
The Spectra Gutenberg Blocks – Website Builder for the Block Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `uagb/image` block in all versions up to, and including, 2.19.28 due to insufficient input sanitization and output escaping. 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.
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
WordPress Spectra Legacy 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Spectra Legacy是WordPress基金会的一个CMS组件。 WordPress Spectra Legacy 2.19.28及之前版本存在跨站脚本漏洞，该漏洞源于对输入清理和输出转义不足，可能导致经过身份验证的攻击者（具有Contributor级别及以上权限）通过`uagb/image`区块注入存储型跨站脚本，当用户访问被注入的页面时执行任意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
brainstormforce Spectra Legacy – Gutenberg Blocks 0 ~ 2.19.28 -

II. Public POCs for CVE-2026-12900

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III. Intelligence Information for CVE-2026-12900

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News Coverage for CVE-2026-12900 (1)

IV. Related Vulnerabilities

Same product: Spectra Legacy – Gutenberg Blocks
Same vendor: brainstormforce
Same weakness: CWE-79