EUVD-2026-62539Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network REST API, no interaction needed, low-privilege api.users.write required; full CIA impact via super-admin escalation within same security boundary.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.6, Grav API plugin UsersController::createApiKey(), generate2fa(), and disable2fa() omit the accessGrantsSuper() target check used by sibling user mutation endpoints. A non-super account with api.users.write can mint an API key bound to an access.api.super target through requireApiKeyPermission(), obtain the target's full privileges because key scopes are not enforced, and create persistent super-administrator access; the same missing check also permits rotating or disabling the target's two-factor authentication. This issue is fixed in version 1.0.6.
AnalysisAI
Privilege escalation in Grav API Plugin (all versions before 1.0.6) allows any authenticated user holding the api.users.write permission to mint API keys bound to super-administrator accounts, bypass key scope enforcement, and gain full persistent super-admin access - including the ability to rotate or disable two-factor authentication on targeted accounts. Three endpoints in UsersController - createApiKey(), generate2fa(), and disable2fa() - omitted the accessGrantsSuper() target authorization check that all sibling user mutation endpoints correctly enforced, creating an unguarded escalation path. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated account on the target Grav CMS instance holding the api.users.write ACL permission - this is the specific grant that controls access to the UsersController endpoints and is the non-default condition that gates the attack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score accurately reflects real-world risk: the attack is network-accessible, low complexity, requires no user interaction, and demands only a low-privilege account holding api.users.write - a permission routinely granted to editors, developers, or integration service accounts in multi-user Grav deployments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade grav-plugin-api to version 1.0.6 immediately; this is the vendor-released patch confirmed at https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.6 and via commit dfcc947f0d6758772caac290c68fe8d4c4a4874e. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Grav installations and determine which are running vulnerable API Plugin versions (prior to 1.0.6). …
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External POC / Exploit Code
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