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CVE-2026-72700— Grav before 3.9.1 Timing Attack via Non-Constant-Time Token Comparison

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.

在 getgrav/grav-plugin-login Composer 插件（Grav 所使用）3.9.1 版本之前，classes/Controller.php（taskReset 方法）和 login.php（激活处理程序）中对密码重置令牌和账户激活令牌的比较使用了非恒定时间的 === 字符串比较，而非采用更安全的 hash_equals() 函数。由于令牌提交端点（taskReset）同样缺乏速率限制机制，攻击者理论上可以向已知用户名重复发送令牌猜测请求，并利用响应时间差异尝试恢复有效的令牌。不过，厂商评估

CVSS 7.5 · High
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I. Basic Information for CVE-2026-72700

Vulnerability Information
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Vulnerability Title
Grav before 3.9.1 Timing Attack via Non-Constant-Time Token Comparison
Source: CVE Program / CVE List V5
Vulnerability Description
The getgrav/grav-plugin-login Composer plugin before 3.9.1 (used by Grav) compares password reset and account activation tokens using a non-constant-time === string comparison instead of hash_equals() in classes/Controller.php (taskReset()) and login.php (activation handler). Because the token-submission endpoint (taskReset) also lacks rate limiting, an attacker could in principle send repeated token guesses against a known username and use the timing differences to attempt to recover a valid token, though the vendor rates the practical exploitability as low and no end-to-end network exploit has been demonstrated.
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 ~ 3.9.1 -

II. Public POCs for CVE-2026-72700

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8780 chars
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III. Intelligence Information for CVE-2026-72700

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Vendor Advisories for CVE-2026-72700 (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-2026-76846 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
CVE-2026-72701 3.7 LOW Grav CMS before 2.0.16 Timing Attack via verifyNonce

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-72700

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