Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-72831— Grav through 2.0.11 Authentication Bypass via Flex Objects

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 1.4.6及之前版本存在授权问题漏洞，该漏洞源于Flex Objects API授权检查不正确，FlexApiController::update()仅检查通用Flex目录权限，未应用额外的目标/字段/超级管理员检查，可能导致具备特定权限的已认证账户通过相关接口修改超级管理员密码或授予管理员权限，从而完全接管网站。

CVSS 8.8 · High EPSS 0.56% · P45

Affected Version Matrix 3

VendorProduct Version RangeStatus
getgrav grav 2.0.11≤ 2.0.11 affected
< 1.4.7 affected
1.4.7 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-72831

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 through 2.0.11 Authentication Bypass via Flex Objects
Source: CVE Program / CVE List V5
Vulnerability Description
The Flex Objects plugin (through 1.4.6, tested with Grav 2.0.11) contains an incorrect authorization vulnerability in its Flex Objects API. FlexApiController::update() checks only the general Flex directory permission and does not apply the additional target/field/super-admin checks enforced by the dedicated Users and Groups API controllers. An authenticated account with api.access, admin.login, and users.update permissions (but without api.users.write or admin.super) can use the generic /api/v1/flex-objects/user-accounts endpoint to change a super administrator's password, or the /api/v1/flex-objects/user-groups endpoint to grant its group admin.super, resulting in full site takeover. Fixed in Flex Objects 1.4.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 授权问题漏洞
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 1.4.6及之前版本存在授权问题漏洞，该漏洞源于Flex Objects API授权检查不正确，FlexApiController::update()仅检查通用Flex目录权限，未应用额外的目标/字段/超级管理员检查，可能导致具备特定权限的已认证账户通过相关接口修改超级管理员密码或授予管理员权限，从而完全接管网站。
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 2.0.11 ~ 2.0.11 -
getgrav grav 0 ~ 1.4.7 -

II. Public POCs for CVE-2026-72831

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8853 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-72831

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-72831 (4)

Vendor Advisories for CVE-2026-72831 (2)

Same Patch Batch · getgrav · 2026-08-14 · 15 CVEs total

CVE-2026-72824 8.8 HIGH Grav before 1.0.13 API Key Scope Bypass via PagesController
CVE-2026-72826 8.8 HIGH Grav before 1.0.13 Scope Bypass via createApiKey
CVE-2026-72819 8.8 HIGH Grav CMS before 2.0.13 Remote Code Execution via ZIP Upload
CVE-2026-72822 8.8 HIGH Grav before 1.0.13 Authentication Bypass via disable2fa
CVE-2026-72830 8.8 HIGH Grav API Plugin before 1.0.13 RCE via ConfigController scope bypass
CVE-2026-72833 8.8 HIGH Grav 1.0.6 through 1.0.11 Privilege Escalation via Scoped API Keys
CVE-2026-72829 8.8 HIGH Grav before 1.0.13 API Key Scope Bypass via UsersController
CVE-2026-72827 8.8 HIGH Grav CMS before 2.0.13 Remote Code Execution via Twig
CVE-2026-72825 7.6 HIGH Grav before 1.0.13 API-key scope cap bypass via ReportsController
CVE-2026-72828 7.2 HIGH Grav before 1.0.13 API Key Scope Bypass via InvitationsController
CVE-2026-72821 5.4 MEDIUM Grav Form Plugin before 9.1.15 Stored XSS via Radio Toggle
CVE-2026-72832 5.4 MEDIUM Grav before 2.0.12 Stored XSS via quoted-attribute bypass
CVE-2026-72823 5.4 MEDIUM Grav before 1.0.13 API-key scope cap bypass via DemoController
CVE-2026-72820 4.9 MEDIUM Grav 2.0.11 Path Traversal via Backup Profile Configuration

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-863

V. Comments for CVE-2026-72831

No comments yet

Leave a comment