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CVE-2026-63407— Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses

Quick assessment

Affected
getgrav grav-plugin-api
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 API Plugin是Grav组织的一款提供API接口功能的插件。 Grav API Plugin 1.0.0-rc.16之前版本存在配置错误漏洞，该漏洞源于CorsMiddleware对已验证的/api/v1端点返回Access-Control-Allow-Origin: *和宽松的OPTIONS响应，可能导致任意来源的JavaScript通过Authorization或X-API-Token头提交攻击者获取的JWT，读取已验证响应并执行写操作，造成数据泄露和账户修改。

CVSS 8.2 · High EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav-plugin-api < 1.0.0-rc.16 affected
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I. Basic Information for CVE-2026-63407

Vulnerability Information
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Vulnerability Title
Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses
Source: CVE Program / CVE List V5
Vulnerability Description
Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin CorsMiddleware returns Access-Control-Allow-Origin: * and permissive OPTIONS responses for authenticated /api/v1 endpoints. JavaScript from any origin can submit an attacker-obtained JWT through the Authorization or X-API-Token header, read the authenticated response, and perform write operations with the token owner's privileges, enabling data exfiltration and account modification. This issue is fixed in version 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:C/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
Grav API Plugin 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav API Plugin是Grav组织的一款提供API接口功能的插件。 Grav API Plugin 1.0.0-rc.16之前版本存在配置错误漏洞，该漏洞源于CorsMiddleware对已验证的/api/v1端点返回Access-Control-Allow-Origin: *和宽松的OPTIONS响应，可能导致任意来源的JavaScript通过Authorization或X-API-Token头提交攻击者获取的JWT，读取已验证响应并执行写操作，造成数据泄露和账户修改。
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-api < 1.0.0-rc.16 -

II. Public POCs for CVE-2026-63407

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Qwen3.6-35B-A3B · 8748 chars
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III. Intelligence Information for CVE-2026-63407

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Patches & Fixes for CVE-2026-63407 (1)

Vendor Advisories for CVE-2026-63407 (1)

Vendor Pages for CVE-2026-63407 (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-2026-64851 8.5 HIGH Grav Shortcode Core Plugin: Stored XSS in shortcode-core attribute handlers
CVE-2026-62673 8.2 HIGH Grav: .htaccess file extension rules bypass via case variation on case-insensitive filesys
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 product: grav-plugin-api
Same vendor: getgrav
Same weakness: CWE-942

V. Comments for CVE-2026-63407

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