---
cve: "CVE-2026-72831"
severity: "HIGH"
cvss: 8.7
epss: "30%"
vendor: "getgrav"
kev: false
exploited: false
published: "2026-08-14 12:16:46"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-09T23:05:51+02:00"
---

# CVE-2026-72831

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- ad9709f865b09b68798fb1ac375b484a8cc1d892 (Commit)
- a0bf26f7e5d7a98894b7cd2b8c5afe419b264e53 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72831) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_