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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.

在 Grav CMS 2.0.16 版本之前， 函数存在一个时间侧信道漏洞。该函数在使用 运算符进行非恒定时间字符串比较，而非使用 来验证 CSRF（跨站请求伪造）nonce 值。攻击者可以通过多次请求测量响应时间的差异，逐字节地恢复有效的 nonce 值，从而削弱 CSRF 保护机制，使其安全性低于预期安全水平。

CVSS 3.7 · Low EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.16 affected
2.0.16 unaffected
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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

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav 0 ~ 2.0.16 -

II. Public POCs for CVE-2026-72701

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III. Intelligence Information for CVE-2026-72701

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Vendor Advisories for CVE-2026-72701 (2)

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

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-208

V. Comments for CVE-2026-72701

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