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CVE-2026-58655— Grav Flex Objects - Server-Side Template Injection via Dynamic Titles

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 1.4.0之前版本存在代码注入漏洞，该漏洞源于存储型服务器端模板注入问题。在渲染动态集合或对象标题时，该插件将用户控制的前置元数据值传递给Twig的template_from_string()，导致这些值被评估为Twig代码而不是作为文本处理，且绕过了Grav的Security::cleanDangerousTwig()清理。可能控制公开访问的Flex Objects页面标题前置元数据的攻击者能够

CVSS 8.8 · High EPSS 1.12% · P65

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 1.4.0 affected
1.4.0 unaffected
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I. Basic Information for CVE-2026-58655

Vulnerability Information
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Vulnerability Title
Grav Flex Objects - Server-Side Template Injection via Dynamic Titles
Source: CVE Program / CVE List V5
Vulnerability Description
The bundled Grav Flex Objects plugin (getgrav/grav-plugin-flex-objects) before 1.4.0 contains a stored server-side template injection vulnerability. When rendering dynamic collection or object titles, the plugin passes user-controlled frontmatter values (page.header.flex.collection.title or page.header.flex.object.title) to Twig's template_from_string(), causing them to be evaluated as Twig code rather than treated as text. This path bypasses Grav's Security::cleanDangerousTwig() sanitization. An attacker who can control the title frontmatter of a publicly reachable Flex Objects page can achieve arbitrary Twig execution and escalate to remote command execution via access to internal Grav services such as the scheduler.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
getgrav Grav 代码注入漏洞
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 1.4.0之前版本存在代码注入漏洞，该漏洞源于存储型服务器端模板注入问题。在渲染动态集合或对象标题时，该插件将用户控制的前置元数据值传递给Twig的template_from_string()，导致这些值被评估为Twig代码而不是作为文本处理，且绕过了Grav的Security::cleanDangerousTwig()清理。可能控制公开访问的Flex Objects页面标题前置元数据的攻击者能够
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 ~ 1.4.0 -

II. Public POCs for CVE-2026-58655

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6331 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-58655

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Vendor Advisories for CVE-2026-58655 (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-2026-61457 8.8 HIGH Grav before 1.0.3 Remote Code Execution via File Upload Extension Bypass
CVE-2026-61873 8.1 HIGH Grav before 9.1.8 Arbitrary File Write via Twig-Processed Filename
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-94

V. Comments for CVE-2026-58655

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