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CVE-2026-64851— Grav Shortcode Core Plugin: Stored XSS in shortcode-core attribute handlers

Quick assessment

Affected
getgrav grav-plugin-shortcode-core
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 Shortcode Core Plugin是Grav组织的一款为内容管理系统提供短代码功能的插件。 Grav Shortcode Core Plugin 6.2.2之前版本存在跨站脚本漏洞，该漏洞源于ColorShortcode.php及相关属性处理器将攻击者控制的参数未经编码直接连接到HTML中，可能导致具有admin.pages权限的攻击者创建存储型跨站脚本，当访客或管理员查看页面时执行。

CVSS 8.5 · High EPSS 0.34% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav-plugin-shortcode-core < 6.2.2 affected
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I. Basic Information for CVE-2026-64851

Vulnerability Information
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Vulnerability Title
Grav Shortcode Core Plugin: Stored XSS in shortcode-core attribute handlers
Source: CVE Program / CVE List V5
Vulnerability Description
Grav Shortcode Core Plugin allows for the development shortcode plugins that utilize the common format utilized by WordPress and BBCode. Prior to 6.2.2, Grav Shortcode Core passes shortcode syntax through Security::detectXss() because it contains no literal less-than character, then ColorShortcode.php and related attribute handlers concatenate an attacker-controlled parameter into HTML without encoding. An account with admin.pages permission can close the generated attribute and add an event handler, creating stored cross-site scripting that executes for visitors or administrators who view the page. This issue is fixed in version 6.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/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 Shortcode Core Plugin 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav Shortcode Core Plugin是Grav组织的一款为内容管理系统提供短代码功能的插件。 Grav Shortcode Core Plugin 6.2.2之前版本存在跨站脚本漏洞，该漏洞源于ColorShortcode.php及相关属性处理器将攻击者控制的参数未经编码直接连接到HTML中，可能导致具有admin.pages权限的攻击者创建存储型跨站脚本，当访客或管理员查看页面时执行。
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-plugin-shortcode-core < 6.2.2 -

II. Public POCs for CVE-2026-64851

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9441 chars
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III. Intelligence Information for CVE-2026-64851

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Patches & Fixes for CVE-2026-64851 (1)

Vendor Advisories for CVE-2026-64851 (1)

Vendor Pages for CVE-2026-64851 (1)

Same Patch Batch · getgrav · 2026-08-19 · 17 CVEs total

CVE-2026-62668 9.4 CRITICAL Grav API Plugin: Webhook SSRF via Unrestricted cURL Protocols
CVE-2026-62666 8.8 HIGH Grav API Plugin: non-super api.users.write manager -> super-admin via createApiKey (incomp
CVE-2026-64850 8.7 HIGH Grav: Remote code execution via unrestricted callable in Blueprint::dynamicData()
CVE-2026-64852 8.7 HIGH Grav API Plugin: Missing authorization on API-key generate/revoke lets any admin.login use
CVE-2026-62673 8.2 HIGH Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesys
CVE-2026-63407 8.2 HIGH Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses
CVE-2026-62667 8.1 HIGH Grav API Plugin : API Key 'scopes' Never Enforced - Delegated Least-Privilege Keys Carry F
CVE-2026-63408 7.5 HIGH Grav API Plugin: JWT Access Token Accepted via `?token=` URL Query Parameter
CVE-2026-62669 7.4 HIGH Grav Login Plugin: 2FA Bypass via 'login.regenerate2FASecret' - Secret Rotation During Pen
CVE-2026-61690 6.5 MEDIUM Grav: Decompression Bomb via ZipArchiver - Missing Extraction Limits
CVE-2026-61842 6.5 MEDIUM Grav: Twig sandbox config exfiltration via grav.offsetGet + dump filter (CVE-2026-44738 by
CVE-2026-62670 6.3 MEDIUM Fail-open authorization in grav-plugin-flex-objects admin-next API: api.access user gets f
CVE-2026-62672 6.0 MEDIUM Grav: Authenticated ReDoS via regex_replace in Twig Sandbox
CVE-2026-62671 5.4 MEDIUM CSRF in grav-plugin-login: anonymous attacker rotates a logged-in user's 2FA (TOTP) secret
CVE-2026-53654 5.3 MEDIUM Grav: Unauthenticated open redirect via login twofa_cancel _redirect
CVE-2026-61607 4.6 MEDIUM Grav API Plugin: Stored XSS via SVG Upload - API Media Pipeline Bypasses Sanitizer

IV. Related Vulnerabilities

Same vendor: getgrav
Same weakness: CWE-79

V. Comments for CVE-2026-64851

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