CVE-2026-76839— Grav before 2.0.16 Information Disclosure via offsetGet
Quick assessment
Affected
getgrav grav
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 2.0.16之前版本存在信任管理问题漏洞，该漏洞源于沙箱Twig模板通过允许列表的offsetGet()和offsetExists()方法访问敏感User字段时缺乏字段过滤，可能导致具有页面编辑权限的攻击者调用offsetGet()提取哈希密码和2FA密钥，从而进行离线密码破解和身份验证绕过。
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I. Basic Information for CVE-2026-76839
Vulnerability Information
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Vulnerability Title
Grav before 2.0.16 Information Disclosure via offsetGet
Source: CVE Program / CVE List V5
Vulnerability Description
Grav before 2.0.16 allows sandboxed Twig templates to access sensitive User fields through allow-listed offsetGet() and offsetexists() methods that lack field filtering. Attackers with page-edit permissions can call offsetGet() on User objects to extract hashed passwords and 2FA secrets, enabling offline password cracking and authentication bypass.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 信任管理问题漏洞
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 2.0.16之前版本存在信任管理问题漏洞，该漏洞源于沙箱Twig模板通过允许列表的offsetGet()和offsetExists()方法访问敏感User字段时缺乏字段过滤，可能导致具有页面编辑权限的攻击者调用offsetGet()提取哈希密码和2FA密钥，从而进行离线密码破解和身份验证绕过。
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
II. Public POCs for CVE-2026-76839
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-76839 (2)
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🔗 Grav before 2.0.16 Information Disclosure via offsetGet | Advisories | VulnCheck third-party-advisory
Same Patch Batch · getgrav · 2026-08-25 · 15 CVEs total
| CVE-2026-56710 | 9.8 CRITICAL | Grav Login Plugin before 1.0.16 Privilege Escalation via Unlock |
| CVE-2026-75574 | 8.8 HIGH | Grav before 4.2.2 Remote Code Execution via Email Twig |
| CVE-2026-72696 | 8.4 HIGH | Grav CMS before 2.0.16 Symlink Following via createLockFile |
| CVE-2026-72695 | 8.1 HIGH | Grav before 2.0.16 Path Traversal via MediaUploadTrait deleteFile |
| CVE-2026-56707 | 7.7 HIGH | Grav Flex Objects 1.4.0 through 1.4.7 Authorization Bypass via Shortcode |
| CVE-2026-72700 | 7.5 HIGH | Grav before 3.9.1 Timing Attack via Non-Constant-Time Token Comparison |
| CVE-2026-76846 | 7.5 HIGH | Grav before 2.0.16 Information Disclosure via Twig Sandbox |
| CVE-2026-56709 | 7.5 HIGH | Grav before 3.9.2 Host Header Injection via sendInvitationEmail |
| CVE-2026-72698 | 6.5 MEDIUM | Grav CMS before 2.0.16 Information Disclosure via Twig Sandbox Bypass |
| CVE-2026-72697 | 6.5 MEDIUM | Grav CMS before 2.0.16 Path Traversal via media_directory |
| CVE-2026-72702 | 5.4 MEDIUM | Grav CMS before 2.0.16 Origin Validation Bypass via Referer |
| CVE-2026-72699 | 5.3 MEDIUM | Grav Login Plugin before 3.9.1 Email Enumeration via Registration |
| CVE-2026-56708 | 5.3 MEDIUM | Grav API Plugin before 1.0.16 SSRF via DNS Rebinding |
| CVE-2026-72701 | 3.7 LOW | Grav CMS before 2.0.16 Timing Attack via verifyNonce |
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V. Comments for CVE-2026-76839
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