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Vulnerability record · CVE-2026-72831 · published 14 August 2026

CVE-2026-72831: Incorrect authorization vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.56% · top 55.3% CWE-863 · Incorrect authorization Deferred
8.7CVSS 4.0 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
31 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/getgrav/grav-plugin-admin2/commit/a0bf26f7e5d7a98894b7cd2b8c5afe419b264e53
https://github.com/getgrav/grav-plugin-api/commit/8071c10bc3a4743a4b8cf003dfb1644d6680c2ea
https://github.com/getgrav/grav/commit/ad9709f865b09b68798fb1ac375b484a8cc1d892
https://github.com/getgrav/grav/security/advisories/GHSA-pc8m-jxvh-vmrc
https://github.com/trilbymedia/grav-plugin-flex-objects/commit/0b384f5b0e73b1ad9dd29c70185407895ea3b09f
https://www.vulncheck.com/advisories/grav-through-authentication-bypass-via-flex-objects
https://github.com/getgrav/grav/security/advisories/GHSA-pc8m-jxvh-vmrc

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Source: NIST National Vulnerability Database (record CVE-2026-72831), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.