Vulnerability · Published Aug 14, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity incorrect authorization in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.9%top 41.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	2.0.11 – through 2.0.11
trilbymedia	grav-plugin-flex-objects	0 – before 1.4.7

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-pc8m-jxvh-vmrc) vendor-advisory
Patch Commit patch
Patch Commit patch
Patch Commit patch
Patch Commit patch
VulnCheck Advisory: Grav through 2.0.11 Authentication Bypass via Flex Objects third-party-advisory