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CVE-2026-62387— Grav < 1.0.0-rc.16 CORS Misconfiguration via API Plugin

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 1.0.0-rc.16之前版本存在配置错误漏洞，该漏洞源于跨资源共享配置不当，默认设置了Access-Control-Allow-Origin:*，可能导致攻击者获取有效访问令牌后，通过JavaScript在外部网站发出经过身份验证的跨域请求，读取敏感数据并执行写入操作。

CVSS 7.1 · High EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1556.003 · Pluggable Authentication Modules

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 1.0.0-rc.16 affected
1.0.0-rc.16 unaffected
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I. Basic Information for CVE-2026-62387

Vulnerability Information
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Vulnerability Title
Grav < 1.0.0-rc.16 CORS Misconfiguration via API Plugin
Source: CVE Program / CVE List V5
Vulnerability Description
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.0-rc.16 shipped Access-Control-Allow-Origin: * as its default CORS configuration on all responses, including authenticated endpoints and preflight (OPTIONS) responses. Because the plugin accepts credentials via the Authorization and X-API-Token headers (set programmatically by JavaScript rather than via cookies), an attacker who obtains a valid access token (e.g., via log leakage, Referer headers, browser history, or network capture) can issue fully authenticated cross-origin requests from any malicious website to read sensitive data and perform write operations as the token's user. Fixed in 1.0.0-rc.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过度许可的跨域白名单
Source: CVE Program / CVE List V5
Vulnerability Title
getgrav Grav 配置错误漏洞
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 1.0.0-rc.16之前版本存在配置错误漏洞，该漏洞源于跨资源共享配置不当，默认设置了Access-Control-Allow-Origin:*，可能导致攻击者获取有效访问令牌后，通过JavaScript在外部网站发出经过身份验证的跨域请求，读取敏感数据并执行写入操作。
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 ~ 1.0.0-rc.16 -

II. Public POCs for CVE-2026-62387

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7808 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-2026-62387

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Vendor Advisories for CVE-2026-62387 (2)

Same Patch Batch · getgrav · 2026-07-17 · 10 CVEs total

CVE-2026-62233 8.8 HIGH grav-plugin-api < 1.0.6 Privilege Escalation via createApiKey
CVE-2026-62234 8.1 HIGH Grav < 2.0.4 SSRF via Unrestricted cURL Protocols
CVE-2026-62231 8.1 HIGH Grav < 1.0.6 API Key Scope Bypass via ApiKeyAuthenticator
CVE-2026-62386 7.5 HIGH Grav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter
CVE-2026-62230 7.5 HIGH Grav < 2.0.4 File Access Bypass via Case Variation
CVE-2026-62232 7.4 HIGH Grav < 2.0.4 2FA Bypass via Secret Regeneration
CVE-2026-62237 6.5 MEDIUM Grav < 2.0.4 ReDoS via regex_replace in Sandbox
CVE-2026-62235 6.3 MEDIUM Grav Flex-Objects < 1.4.3 Authorization Bypass via API
CVE-2026-62236 5.4 MEDIUM grav-plugin-login < 3.8.11 CSRF via regenerate2FASecret

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-942