EUVD-2026-58643
GHSA-prpx-fhmf-2g8p
Severity by source
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:X/V:X/RE:X/U:X
Requires low-privilege API key over network (AV:N/PR:L); full C/I/A impact within Grav's authorization boundary (S:U); no complexity or interaction barriers.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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:X/V:X/RE:X/U:X
Lifecycle Timeline
7DescriptionCVE.org
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.13 contains an API-key scope-cap bypass in UsersController's create() and update() methods. These methods enforce the scope cap only for api.users.write, but gate super-privilege grants on a bare isSuperAdmin() check that reads access.api.super directly without consulting the key's scopes. As a result, an api.users.write-scoped key minted on a super account can set access.api.super or assign a super-granting group to mint or promote a full super account, then authenticate as that account for uncapped administrative privileges.
AnalysisAI
Privilege escalation in the Grav API plugin (getgrav/grav-plugin-api) before 1.0.13 allows an authenticated API key holder with api.users.write scope to silently bypass the scope-cap enforcement and self-elevate to super-administrator. The flaw lies in UsersController's create() and update() methods, which validate scope caps only for api.users.write actions but fall back to a bare isSuperAdmin() check - reading access.api.super from the parent account rather than the key's own scope - when granting super privileges, allowing a limited key on a super account to mint or promote unrestricted admin accounts. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess a valid api.users.write-scoped API key that was specifically minted on (i.e., associated with) a super-admin Grav account - a key of the same scope issued on a non-super account cannot trigger the bypass because isSuperAdmin() on that parent returns false. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) describes a network-reachable, low-complexity flaw requiring only low-privilege API credentials, with high impact across confidentiality, integrity, and availability - consistent with the ability to mint uncapped super accounts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker possessing a valid api.users.write-scoped API key issued on a super-admin Grav account sends a crafted POST request to the UsersController create() or update() endpoint, supplying a payload that sets access.api.super on a target account or adds it to a super-granting group. Because isSuperAdmin() resolves against the parent account rather than the key's scope, the check passes and the privilege assignment succeeds; the attacker then authenticates as the newly promoted account and gains unrestricted super-administrator access. … |
| Remediation | Upgrade the Grav API plugin to version 1.0.13 or later, which corrects the scope-cap bypass in UsersController's create() and update() methods; the vendor advisory is at https://github.com/getgrav/grav/security/advisories/GHSA-jrm3-jpp7-3gmx. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running getgrav/grav-plugin-api and document current versions and deployment context. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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