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Grav API Plugin CVE-2026-72833

| EUVDEUVD-2026-58647 HIGH
Improper Privilege Management (CWE-269)
2026-08-14 VulnCheck GHSA-72v8-h9pq-46p7
Privilege Escalation Grav
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
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
vuln.today AI
9.9 CRITICAL

Network-exploitable with low-privilege API key; scope change applies because ACL rewriting elevates arbitrary third-party accounts, extending impact beyond the vulnerable component.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 14, 2026 - 12:24 vuln.today
CVE Published
Aug 14, 2026 - 11:35 cve.org
HIGH 8.7

DescriptionCVE.org

The Grav API plugin (getgrav/grav-plugin-api) versions >= 1.0.6 and <= 1.0.11 contain a privilege escalation vulnerability. A scoped API key minted on a super-admin account bypasses its declared scope cap on four isSuperAdmin()-gated write endpoints (in GroupsController, AccountsConfigController, PreferencesController, and DashboardWidgetController). These endpoints authorize via a super-admin early-return that never invokes requirePermission()-the sole enforcement point of the scope cap-so a 'read-only'-scoped key (e.g. api.pages.read) can perform super-only write operations, including rewriting group ACL maps to grant super-admin privileges to arbitrary accounts. A leaked or delegated read-only CI/monitoring key can therefore gain full super-admin write capability. Fixed in 1.0.13.

AnalysisAI

Privilege escalation in getgrav/grav-plugin-api versions 1.0.6 through 1.0.11 allows any holder of a scoped, read-only API key to perform super-admin write operations - including rewriting group ACL maps to elevate arbitrary accounts to super-admin. The flaw exists because four privileged write endpoints (GroupsController, AccountsConfigController, PreferencesController, DashboardWidgetController) authorize via an isSuperAdmin() early-return that entirely skips requirePermission(), the only function that enforces scope caps on API keys. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain super-admin-scoped API key
Delivery
Send crafted write request to privileged endpoint
Exploit
isSuperAdmin() early-return skips requirePermission()
Execution
Rewrite group ACL map via GroupsController
Persist
Elevate attacker account to super-admin
Impact
Full Grav instance takeover
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Vulnerability AssessmentAI

Exploitation The Grav API plugin (getgrav/grav-plugin-api) must be installed and enabled at versions 1.0.6 through 1.0.11. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:L/UI:N) accurately reflects the risk profile: network-exploitable over standard HTTP, low complexity once a key is in hand, and requiring only low-privilege credentials (a scoped API key). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker obtains a read-only API key (e.g., api.pages.read scope) originally issued to a CI pipeline - via a leaked .env file, a compromised secrets manager, or insider access. The attacker sends an authenticated POST request to the GroupsController write endpoint with a crafted payload that rewrites the ACL map for a target group, granting super-admin privileges to an attacker-controlled account. …
Remediation Upgrade the Grav API plugin to version 1.0.13 or later, which fixes the scope enforcement bypass by ensuring requirePermission() is invoked on all write endpoints regardless of the isSuperAdmin() check result. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all deployments using Grav plugin API and determine if any are within versions 1.0.6-1.0.11; prioritize systems exposing API keys in CI/CD pipelines or monitoring integrations. …

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CVE-2026-72833 vulnerability details – vuln.today
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