CVE-2026-100670 Grav CMS 2.0.14 through 2.0.24 Privilege Escalation via Blueprint Guard Bypass
Authenticated backend operators can escalate to super-admin by bypassing blueprint guards via dot-notation keys, gaining full control.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100670?
CVE-2026-100670 is a high-severity vulnerability in getgrav grav, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Grav CMS 2.0.14 through 2.0.24 contains a privilege escalation vulnerability in the group and account blueprints. The access map is gated by a `security@: admin.super` guard that is resolved by the field's exact path, so a submitted flat dot-notation key such as `access.admin.super` (instead of the nested `access[admin][super]`) matches no blueprint rule, survives BlueprintSchema::filterArray() and flattening, and is written by FlexObject::update() via setNestedProperty(), which splits on `.` and reconstructs the nested value. An authenticated backend operator using the flex accounts backend who holds admin.users but not admin.super can therefore grant admin.super to their own account or to a group they belong to and escalate to full super-admin, gaining control over configuration, plugin and theme installation, the file manager, and all accounts. Fixed in 2.0.25, which drops any dotted key whose ancestor path is disabled or marked validate.ignore.
Weakness: CWE-639
Which versions are affected by CVE-2026-100670?
How do I fix CVE-2026-100670?
No fix has been published for CVE-2026-100670 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-100670 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100670 exists.
Sources
Also known as GHSA-mwjj-r7vm-pgqm, GHSA-xw59-q7ph-pgh5.