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CVE-2026-56700— Grav - Multiple Remote Code Execution Vulnerabilities via Unsafe Unserialize and Command Injection

Quick assessment

Affected
Grav Grav
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grav Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 2.0.0-beta.2之前版本存在安全漏洞，该漏洞源于Scheduler\JobQueue、Framework\Cache\Adapter\FileCache和Session中的不安全unserialize()调用反序列化不受信任数据且未限制允许类，结合小工具链导致PHP对象注入和任意代码执行；同时InstallCommand的git clone操作将branch、url和path参数未转义传入shell命令，允许

CVSS 9.8 · Critical EPSS 2.53% · P84

Affected Version Matrix 2

VendorProduct Version RangeStatus
Grav Grav < 2.0.0-beta.2 affected
2.0.0-beta.2 unaffected
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I. Basic Information for CVE-2026-56700

Vulnerability Information
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Vulnerability Title
Grav - Multiple Remote Code Execution Vulnerabilities via Unsafe Unserialize and Command Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Grav CMS before 2.0.0-beta.2 contains multiple code-execution vulnerabilities. Three unsafe unserialize() calls - in Scheduler\JobQueue, Framework\Cache\Adapter\FileCache, and Session - deserialize untrusted data without restricting allowed classes, enabling PHP object injection and, via a gadget chain, arbitrary code execution where an attacker controls the serialized input. Additionally, InstallCommand's git clone operation passes the branch, url, and path parameters into a shell command without escaping, allowing OS command injection via plugin/theme installation (which requires admin access). A Twig security blocklist bypass (server-side template injection) is also present. The issues are fixed in 2.0.0-beta.2.
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
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 2.0.0-beta.2之前版本存在安全漏洞，该漏洞源于Scheduler\JobQueue、Framework\Cache\Adapter\FileCache和Session中的不安全unserialize()调用反序列化不受信任数据且未限制允许类，结合小工具链导致PHP对象注入和任意代码执行；同时InstallCommand的git clone操作将branch、url和path参数未转义传入shell命令，允许
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
Grav Grav 0 ~ 2.0.0-beta.2 -

II. Public POCs for CVE-2026-56700

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9864 chars
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III. Intelligence Information for CVE-2026-56700

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Vendor Advisories for CVE-2026-56700 (2)

IV. Related Vulnerabilities

Same product: Grav
Same vendor: Grav
Same weakness: CWE-78

V. Comments for CVE-2026-56700

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