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CVE-2026-75831— Grav before 2.0.15 Stored XSS via audio/video source URL

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.

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 2.0.15之前版本存在跨站脚本漏洞，该漏洞源于音频和视频媒体渲染过程中，媒体URL片段未转义拼接至rawHtml source元素，可能导致存储型跨站脚本攻击，攻击者能够注入任意HTML和JavaScript并在查看者会话中执行。

CVSS 7.6 · High EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.15 affected
2.0.15 unaffected
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I. Basic Information for CVE-2026-75831

Vulnerability Information
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Vulnerability Title
Grav before 2.0.15 Stored XSS via audio/video source URL
Source: CVE Program / CVE List V5
Vulnerability Description
Grav before 2.0.15 contains a stored cross-site scripting vulnerability in the audio and video media rendering through the sourceParsedownElement method. The media URL fragment is concatenated unescaped into rawHtml source elements, allowing attackers to inject arbitrary HTML and JavaScript that executes in viewers' sessions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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
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 2.0.15之前版本存在跨站脚本漏洞，该漏洞源于音频和视频媒体渲染过程中，媒体URL片段未转义拼接至rawHtml source元素，可能导致存储型跨站脚本攻击，攻击者能够注入任意HTML和JavaScript并在查看者会话中执行。
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 ~ 2.0.15 -

II. Public POCs for CVE-2026-75831

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8868 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-2026-75831

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Patches & Fixes for CVE-2026-75831 (1)

Vendor Advisories for CVE-2026-75831 (2)

Same Patch Batch · getgrav · 2026-08-18 · 14 CVEs total

CVE-2026-75837 9.1 CRITICAL Grav before 2.0.14 Privilege Escalation via Group Access Field
CVE-2026-75836 8.8 HIGH Grav API Plugin before 1.0.14 Missing Authorization
CVE-2026-75827 8.8 HIGH Grav before 2.0.15 Arbitrary File Write via error_log
CVE-2026-75828 8.7 HIGH Grav before 2.0.15 Stored XSS via detectXss() Quote Bypass
CVE-2026-75829 8.1 HIGH grav-plugin-api before 1.0.15 Twig SSTI via translate endpoint
CVE-2026-75830 7.1 HIGH grav-plugin-api before 1.0.15 Path Traversal via batchCopy
CVE-2026-74907 5.9 MEDIUM Grav before 2.0.15 Path Traversal via plugin-asset-map.php
CVE-2026-75107 5.4 MEDIUM Grav Form Plugin before 9.1.19 Stored XSS via Field Properties
CVE-2026-75834 5.4 MEDIUM Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte
CVE-2026-74908 4.6 MEDIUM Grav plugin-api before 1.0.15 Script Injection via SVG
CVE-2026-75832 4.3 MEDIUM Grav API Plugin before 1.0.14 Authorization Bypass
CVE-2026-75835 4.3 MEDIUM Grav API Plugin before 1.0.14 Missing Authorization
CVE-2026-75833 4.2 MEDIUM Grav API Plugin Open Redirect via Backslash Bypass

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-75831

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