EUVD-2026-66395Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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 a valid scoped API key (PR:L) over the network; confirmed impact is limited disclosure of permission fields (C:L) with unconfirmed, bounded edit capability (I:L) and no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
3DescriptionCVE.org
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.18 does not apply the API-key scope cap in the injectSecurityTab() function of BlueprintController when deciding whether a page's security/permissions blueprint section is editable. Because the function performs raw isSuperAdmin()/hasPermission() checks without a request parameter, it cannot enforce scopeAllows(). A caller holding a scoped API key may therefore see (and potentially edit) page permission fields beyond the scope granted to the key. The end-to-end write-time impact was not fully confirmed by the reporter.
AnalysisAI
Broken authorization in the Grav API plugin (getgrav/grav-plugin-api) before 1.0.18 lets a holder of a scoped API key view - and potentially edit - a page's security/permission blueprint section beyond the scope their key was granted. The flaw lives in injectSecurityTab() of BlueprintController, which decides editability using raw isSuperAdmin()/hasPermission() checks and never calls scopeAllows(), so the per-key scope cap is silently bypassed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the Grav API plugin (getgrav/grav-plugin-api) installed and enabled at a version before 1.0.18, with scoped API keys in use, and the attacker must possess a valid scoped API key and be able to reach the blueprint/page-edit API endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 4.0 score is 9.3 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H), but that vector conflicts with the description: the described attacker must already hold a valid scoped API key, which is a form of authentication, so PR:N (fully unauthenticated) appears overstated - verify with the vendor, as this materially lowers realistic severity. … 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 the Grav API plugin to version 1.0.18 or later, which restores scope enforcement in injectSecurityTab(); this is the primary and recommended fix per the vendor advisory (https://github.com/getgrav/grav/security/advisories/GHSA-mcx6-4rvg-7r8v). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Grav deployments to identify API plugin versions in use and determine exposure scope; audit current API key assignments and revoke or restrict any overprivileged keys to minimum necessary permissions; contact getgrav developers to confirm patch timeline and request interim guidance. …
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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