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Grav API Plugin CVE-2026-75835

| EUVDEUVD-2026-60599 CRITICAL
Missing Authorization (CWE-862)
2026-08-18 VulnCheck GHSA-c746-wcwc-p482
PHP Information Disclosure Authentication Bypass Grav
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
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
vuln.today AI
4.3 MEDIUM

Requires a valid (scoped) API key so PR:L not PR:N; impact is disclosure of UI metadata only, so C:L with I:N and A:N.

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

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

Lifecycle Timeline

3
Patch available
Aug 18, 2026 - 12:02 EUVD
Analysis Generated
Aug 18, 2026 - 11:52 vuln.today
CVE Published
Aug 18, 2026 - 11:19 cve.org
CRITICAL 9.3

DescriptionCVE.org

Grav API plugin (getgrav/grav-plugin-api) before 1.0.14 contains a missing authorization vulnerability in userPassesAuthorize() (AbstractApiController.php). The function fails to consult the calling request's API key scopes, relying instead on the account's raw super-admin flag and ACL grants. As a result, an authenticated attacker holding a scoped API key minted on a privileged account can bypass their declared scope restrictions to access authorize-gated UI metadata and item definitions (sidebar/menubar/widget items and users-list columns/row-actions/filter-tabs) that their key scope should deny, resulting in information disclosure.

Articles & Coverage 1

News Critical API Key Scope Bypass in Grav CMS PHP Plugin - CVE-2026-75835 Aug 18, 2026

AnalysisAI

Broken API-key scope enforcement in the Grav CMS API plugin (getgrav/grav-plugin-api) before 1.0.14 lets an authenticated holder of a restricted, scoped API key read authorize-gated administrative UI metadata that their scope should forbid. Because userPassesAuthorize() checks the underlying account's super-admin flag and ACL grants instead of the presenting key's declared scopes, a low-privilege key minted on a privileged account inherits the account's full authorization, exposing sidebar/menubar/widget item definitions and users-list columns, row-actions, and filter-tabs. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain scoped API key on privileged account
Delivery
Send authorize-gated API request beyond scope
Exploit
userPassesAuthorize checks account not key scope
Execution
Return gated UI metadata
Impact
Information disclosure
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to already hold a valid API key that was minted on a privileged (super-admin or ACL-granted) Grav account, even if that key is nominally scope-restricted - the bug is that the declared scope is ignored. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals conflict and should be reconciled before prioritization. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An operator issues a deliberately scope-limited API key on a super-admin Grav account for a downstream integration; the integration (or an attacker who obtains that key) sends authorize-gated API requests outside the key's declared scope. Because the plugin authorizes against the account's super-admin flag instead of the key scope, the requests succeed and return sidebar/menubar/widget item definitions and users-list metadata the key should have been denied, disclosing administrative UI structure. …
Remediation Vendor-released patch: 1.0.14 - upgrade the Grav API plugin to 1.0.14 or later, which corrects userPassesAuthorize() to consult the presenting request's API key scopes. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all API key usage in Grav CMS deployments to identify scoped keys created on privileged accounts and review access logs for unauthorized queries to administrative endpoints. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-75835 vulnerability details – vuln.today
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