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CVE-2026-65603— Grav Login Plugin 3.8.11 Privilege Escalation via Profile Update

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 Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 3.8.11及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于经过身份验证的配置文件自更新处理程序（processUserProfile()，update_user任务）在持久化用户提交的表单数据之前未剥离权限字段（'groups'，'access'），可能导致低权限经过身份验证的用户通过特制的配置文件表单数据（例如access[admin][super]=true）提升权限至超级管理员。

CVSS 8.8 · High EPSS 0.44% · P36

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 3.8.12 affected
3.8.12 unaffected
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I. Basic Information for CVE-2026-65603

Vulnerability Information
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Vulnerability Title
Grav Login Plugin 3.8.11 Privilege Escalation via Profile Update
Source: CVE Program / CVE List V5
Vulnerability Description
The Grav Login plugin (grav-plugin-login) versions <= 3.8.11 contain a privilege escalation flaw in the authenticated profile self-update handler (processUserProfile(), the update_user task). Unlike the registration handler, this handler does not strip privilege fields ('groups','access') from user-submitted form data before persisting them. When an administrator has added 'groups' and/or 'access' to plugins.login.user_registration.fields and the default 'regular'/DataUser account backend is in use, a low-privilege authenticated user can POST crafted profile form data (e.g. access[admin][super]=true) to escalate to super-admin, enabling admin panel access, scheduler abuse (RCE), and Twig evaluation. Fixed in 3.8.12.
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
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 3.8.11及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于经过身份验证的配置文件自更新处理程序（processUserProfile()，update_user任务）在持久化用户提交的表单数据之前未剥离权限字段（'groups'，'access'），可能导致低权限经过身份验证的用户通过特制的配置文件表单数据（例如access[admin][super]=true）提升权限至超级管理员。
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 ~ 3.8.12 -

II. Public POCs for CVE-2026-65603

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: access.admin.super was not escalated (after= super: false)
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
Qwen3.6-35B-A3B · 11682 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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POC zip download
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III. Intelligence Information for CVE-2026-65603

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Vendor Advisories for CVE-2026-65603 (2)

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-269

V. Comments for CVE-2026-65603

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