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CVE-2026-86197— Grav before 2.0.20 Cross-Site Scripting via Assets Sandbox

Quick assessment

Affected
getgrav grav
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.

Grav是Grav组织开源的一款基于文件的扁平化内容管理系统。 Grav 2.0.20之前版本存在跨站脚本漏洞，该漏洞源于Twig沙箱策略允许addJs和addCss方法但缺乏正确的输出转义，可能导致页面编辑器注入任意脚本，这些脚本未转义渲染到文档头标签中，对所有访问者（包括管理员）执行。

CVSS 5.1 · Medium EPSS 0.41% · P34

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.20 affected
2.0.20 unaffected
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I. Basic Information for CVE-2026-86197

Vulnerability Information
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Vulnerability Title
Grav before 2.0.20 Cross-Site Scripting via Assets Sandbox
Source: CVE Program / CVE List V5
Vulnerability Description
Grav before 2.0.20 contains a cross-site scripting vulnerability in the Twig sandbox policy that allowlists addJs and addCss methods on Grav\Common\Assets without proper output escaping. Page editors can inject arbitrary script by registering malicious assets or injecting attributes, which are rendered unescaped into document head tags and executed for all visitors including administrators.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
Grav 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是Grav组织开源的一款基于文件的扁平化内容管理系统。 Grav 2.0.20之前版本存在跨站脚本漏洞，该漏洞源于Twig沙箱策略允许addJs和addCss方法但缺乏正确的输出转义，可能导致页面编辑器注入任意脚本，这些脚本未转义渲染到文档头标签中，对所有访问者（包括管理员）执行。
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
getgrav grav 0 ~ 2.0.20 -

II. Public POCs for CVE-2026-86197

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III. Intelligence Information for CVE-2026-86197

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Vendor Advisories for CVE-2026-86197 (2)

Same Patch Batch · getgrav · 2026-09-05 · 5 CVEs total

CVE-2026-86196 8.7 HIGH Grav API Plugin before 1.0.20 Authentication Bypass via Host Header
CVE-2026-86195 8.7 HIGH grav-plugin-api 1.0.0 through 1.0.19 Privilege Escalation via Dot-Keyed Super Flag
CVE-2026-86193 8.7 HIGH Grav API Plugin Authentication Bypass via Group-Inherited Super
CVE-2026-86194 6.9 MEDIUM Grav Form Plugin before 9.1.22 Cross-Page Form Execution

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-79

V. Comments for CVE-2026-86197

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