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CVE-2026-61873— Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename

Quick assessment

Affected
getgrav 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.

getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 9.1.8之前版本存在输入验证错误漏洞，该漏洞源于Form plugin的process.save.filename参数在Twig处理前对路径遍历进行了验证，但渲染后未重新验证，攻击者可通过提交包含路径遍历序列的表单数据，利用Twig模板处理写入任意文件（包括PHP webshell）到Web根目录或其他敏感目录。

CVSS 8.1 · High EPSS 0.46% · P37

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 9.1.8 affected
9.1.8 unaffected
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I. Basic Information for CVE-2026-61873

Vulnerability Information
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Vulnerability Title
Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename
Source: CVE Program / CVE List V5
Vulnerability Description
Grav before 9.1.8 contains an arbitrary file write vulnerability in the Form plugin's process.save.filename parameter, which is validated against path traversal before Twig processing but never re-validated after rendering. Attackers can submit form data containing path traversal sequences that are processed through Twig templates, allowing them to write arbitrary files including PHP webshells to the web root or other sensitive directories.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
getgrav Grav 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 9.1.8之前版本存在输入验证错误漏洞，该漏洞源于Form plugin的process.save.filename参数在Twig处理前对路径遍历进行了验证，但渲染后未重新验证，攻击者可通过提交包含路径遍历序列的表单数据，利用Twig模板处理写入任意文件（包括PHP webshell）到Web根目录或其他敏感目录。
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 ~ 9.1.8 -

II. Public POCs for CVE-2026-61873

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7332 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-61873

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Vendor Advisories for CVE-2026-61873 (2)

Same Patch Batch · getgrav · 2026-07-15 · 7 CVEs total

CVE-2026-61451 9.6 CRITICAL Grav before 1.0.4 Password Reset Token Poisoning via admin_base_url
CVE-2026-58655 8.8 HIGH Grav Flex Objects - Server-Side Template Injection via Dynamic Titles
CVE-2026-61457 8.8 HIGH Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass
CVE-2026-61449 6.5 MEDIUM Grav before 2.0.2 Decompression Bomb via Forged ZIP Size
CVE-2026-61453 6.1 MEDIUM Grav before 2.0.1 XSS via Twig String Concatenation
CVE-2026-61452 5.3 MEDIUM Grav before 2.0.4 Improper Session Invalidation JWT Access Tokens

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-73

V. Comments for CVE-2026-61873

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