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CVE-2026-58656— Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter

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 Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 1.0.0-rc.16之前版本存在信息泄露漏洞，该漏洞源于通过?token=URL查询参数接受JWT令牌并响应Access-Control-Allow-Origin: *，允许未经身份验证的攻击者从恶意网站发起完全认证的跨域API请求。

CVSS 7.5 · High EPSS 0.35% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav ≤ 1.0.0-rc.15 affected
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I. Basic Information for CVE-2026-58656

Vulnerability Information
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Vulnerability Title
Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Grav API plugin before v1.0.0-rc.16 accepts JWT tokens via the ?token= URL query parameter and responds with Access-Control-Allow-Origin: *, allowing unauthenticated attackers to make fully authenticated cross-origin API requests from any malicious website. Attackers who obtain a leaked JWT token from access logs, proxy logs, browser history, or Referrer headers can create persistent backdoor super-admin accounts and exfiltrate sensitive configuration and user data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过GET请求中的查询字符串导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 1.0.0-rc.16之前版本存在信息泄露漏洞，该漏洞源于通过?token=URL查询参数接受JWT令牌并响应Access-Control-Allow-Origin: *，允许未经身份验证的攻击者从恶意网站发起完全认证的跨域API请求。
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.15 -

II. Public POCs for CVE-2026-58656

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9460 chars
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III. Intelligence Information for CVE-2026-58656

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Vendor Advisories for CVE-2026-58656 (2)

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-598