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CVE-2026-61453— Grav before 2.0.1 XSS via Twig String Concatenation

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.

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 2.0.1之前版本存在跨站脚本漏洞，该漏洞源于XSS蓝图验证器在Twig处理前对原始页面内容运行，当Twig内容处理启用时，攻击者可利用Twig字符串连接运算符动态构建事件处理程序名、危险标签名或危险协议，导致输出包含活动有效载荷，执行任意JavaScript。

CVSS 6.1 · Medium EPSS 0.26% · P16

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.1 affected
2.0.1 unaffected
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I. Basic Information for CVE-2026-61453

Vulnerability Information
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Vulnerability Title
Grav before 2.0.1 XSS via Twig String Concatenation
Source: CVE Program / CVE List V5
Vulnerability Description
Grav v2.0.0 contains a cross-site scripting vulnerability (fixed in 2.0.1). The XSS blueprint validator (Security::detectXss()) runs on raw page content before Twig processing. When Twig content processing is enabled (twig_content.process_enabled: true), an attacker with page-write API permission can use Twig's string concatenation operator (~) to dynamically construct event handler names, dangerous tag names, or dangerous protocols at render time (e.g. {% set x = "on" ~ "error" %}). The validator sees only the harmless Twig expression and allows the content, but after Twig rendering the output (rendered via {{ page.content|raw }}) contains an active payload such as <img src=1 onerror=alert(1)>, executing arbitrary JavaScript in visitors' browsers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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
getgrav Grav 跨站脚本漏洞
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 2.0.1之前版本存在跨站脚本漏洞，该漏洞源于XSS蓝图验证器在Twig处理前对原始页面内容运行，当Twig内容处理启用时，攻击者可利用Twig字符串连接运算符动态构建事件处理程序名、危险标签名或危险协议，导致输出包含活动有效载荷，执行任意JavaScript。
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 ~ 2.0.1 -

II. Public POCs for CVE-2026-61453

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III. Intelligence Information for CVE-2026-61453

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Vendor Advisories for CVE-2026-61453 (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-2026-61873 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-2026-61452 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-79

V. Comments for CVE-2026-61453

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