CVE-2026-72701— Grav CMS before 2.0.16 Timing Attack via verifyNonce
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之前版本存在侧信道信息泄露漏洞，该漏洞源于Utils::verifyNonce()函数使用非恒定时间字符串比较（===运算符）而非hash_equals()进行CSRF nonce验证，可能导致攻击者通过多次请求测量响应时间差异逐字节恢复有效nonce值，削弱CSRF保护。
Possible ATT&CK Techniques 1 AI
T1595 · Active Scanning
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I. Basic Information for CVE-2026-72701
Vulnerability Information
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Vulnerability Title
Grav CMS before 2.0.16 Timing Attack via verifyNonce
Source: CVE Program / CVE List V5
Vulnerability Description
Grav CMS before 2.0.16 contains a timing vulnerability in Utils::verifyNonce() that uses non-constant-time string comparison with the === operator instead of hash_equals() for CSRF nonce validation. Attackers can measure response timing differences to recover valid nonce values byte-by-byte through multiple requests, weakening CSRF protection below its intended security margin.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 侧信道信息泄露漏洞
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之前版本存在侧信道信息泄露漏洞，该漏洞源于Utils::verifyNonce()函数使用非恒定时间字符串比较（===运算符）而非hash_equals()进行CSRF nonce验证，可能导致攻击者通过多次请求测量响应时间差异逐字节恢复有效nonce值，削弱CSRF保护。
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-2026-72701
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-72701 (2)
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🔗 Grav CMS before 2.0.16 Timing Attack via verifyNonce | 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-2026-76839 | 6.5 MEDIUM | Grav before 2.0.16 Information Disclosure via offsetGet |
| 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 |
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V. Comments for CVE-2026-72701
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