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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.

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 3.9.1之前版本存在侧信道信息泄露漏洞，该漏洞源于使用非恒定时间的===字符串比较而非hash_equals()来比较密码重置和账户激活令牌，且令牌提交端点缺乏速率限制，可能利用时间差异恢复有效令牌。

CVSS 7.5 · High EPSS 0.43% · P36

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 3.9.1 affected
3.9.1 unaffected
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I. Basic Information for CVE-2026-72700

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
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 3.9.1之前版本存在侧信道信息泄露漏洞，该漏洞源于使用非恒定时间的===字符串比较而非hash_equals()来比较密码重置和账户激活令牌，且令牌提交端点缺乏速率限制，可能利用时间差异恢复有效令牌。
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 0 ~ 3.9.1 -

II. Public POCs for CVE-2026-72700

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8780 chars
Pro+ exclusive includes:
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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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