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CVE-2026-104070— SPIP Crayons Plugin < 3.5.0 Authorization Bypass RCE

Quick assessment

Affected
SPIP SPIP Crayons Plugin
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.

SPIP 3.5.0 版本之前的 Crayons 插件存在一个授权缺失漏洞，未经身份验证的攻击者可以通过在 crayons_store.php 中省略 secu_（反伪造）参数，修改任意可编辑对象的字段，导致授权调度器无条件解析一个“始终为真”的处理程序，而不是执行正确的修改检查。攻击者可以利用此漏洞链式攻击：写入恶意的 .html 模板文件、泄露包含站点密钥的敏感配置文件，并伪造已签名的 AJAX 上下文以执行上传的模板，从而实现以 Web 服务器用户身份执行任意 PHP 代码。

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-104070

Vulnerability Information
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Vulnerability Title
SPIP Crayons Plugin < 3.5.0 Authorization Bypass RCE
Source: CVE Program / CVE List V5
Vulnerability Description
The Crayons plugin for SPIP before 3.5.0 contains a missing authorization vulnerability that allows unauthenticated attackers to modify arbitrary editable object fields by omitting the secu_ anti-forgery parameter in crayons_store.php, causing the authorization dispatcher to resolve an unconditionally-true handler instead of the proper modification check. Attackers can chain this flaw to write a malicious .html skeleton file, disclose sensitive configuration files containing the site secret, and forge a signed ajax context to execute the uploaded skeleton, achieving arbitrary PHP code execution as the web-server user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SPIP SPIP Crayons Plugin 0 ~ 3.5.0 -

II. Public POCs for CVE-2026-104070

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III. Intelligence Information for CVE-2026-104070

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Other References for CVE-2026-104070 (3)

IV. Related Vulnerabilities

Same vendor: SPIP
Same weakness: CWE-862

V. Comments for CVE-2026-104070

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