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CVE-2026-72831

Grav through 2.0.11 Authentication Bypass via Flex Objects

HIGH
8.8
CVSS Score
Published: August 14, 2026 at 11:35 AM UTC
Updated: October 29, 2026 at 09:17 PM UTC
2 products affected across 1 vendorGravGrav Plugin Flex Objects

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Severity
HIGH8.8
Exploit prediction
EPSS 0.9%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Grav· Getgravcomposer
90%
2.0.11
Vendor states this is fixed in 1.4.7 (unaffected)
Grav Plugin Flex Objects· Getgrav
89%
All versions

References (9)

Vendor Advisory
Source: cverecord
https://github.com/getgrav/grav/security/advisories/GHSA-pc8m-jxvh-vmrc
Patch
Source: cverecord
https://github.com/getgrav/grav/commit/ad9709f865b09b68798fb1ac375b484a8cc1d892
Source: cverecord
https://github.com/getgrav/grav/commit/0b384f5b0e73b1ad9dd29c70185407895ea3b09f
Source: cverecord
https://github.com/getgrav/grav/commit/8071c10bc3a4743a4b8cf003dfb1644d6680c2ea
Source: cverecord
https://github.com/getgrav/grav/commit/a0bf26f7e5d7a98894b7cd2b8c5afe419b264e53
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/grav-through-authentication-bypass-via-flex-objects
Patch
Source: cverecord
https://github.com/trilbymedia/grav-plugin-flex-objects/commit/0b384f5b0e73b1ad9dd29c70185407895ea3b09f
Patch
Source: cverecord
https://github.com/getgrav/grav-plugin-api/commit/8071c10bc3a4743a4b8cf003dfb1644d6680c2ea

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-863

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