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Grav API Plugin EUVDEUVD-2026-58636

| CVE-2026-72822 HIGH
Missing Authentication for Critical Function (CWE-306)
2026-08-14 VulnCheck GHSA-993x-642g-h4x5
Authentication Bypass Grav
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 CRITICAL
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
9.6 CRITICAL

Network-accessible (AV:N), low complexity (AC:L), valid API key required (PR:L), attack modifies other users' accounts constituting a scope change (S:C), no availability impact (A:N).

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

7
Analysis Updated
Aug 24, 2026 - 11:37 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 24, 2026 - 11:22 vuln.today
cvss_changed
Severity Changed
Aug 24, 2026 - 11:22 NVD
CRITICAL HIGH
CVSS changed
Aug 24, 2026 - 11:22 NVD
9.3 (CRITICAL) 8.7 (HIGH)
Patch available
Aug 14, 2026 - 13:01 EUVD
Analysis Generated
Aug 14, 2026 - 12:31 vuln.today
CVE Published
Aug 14, 2026 - 11:35 cve.org
CRITICAL 9.3

DescriptionCVE.org

The getgrav/grav-plugin-api Composer package before 1.0.13 (affected <= 1.0.12) fails to enforce API key scope caps on the disable2fa endpoint. Unlike the sibling generate2fa endpoint, disable2fa authorizes the admin (non-self) path solely via ACL reads (isSuperAdmin/hasPermission) and never invokes requirePermission(), so the api_key_scopes cap is never applied. As a result, a holder of a narrow-scope API key on a super account, or a non-super account whose ACL includes api.users.write, can force-disable two-factor authentication on any non-super target account via POST /api/v1/users/{user}/2fa/disable without providing a TOTP code, facilitating account takeover.

AnalysisAI

Force-disabling of two-factor authentication on Grav CMS user accounts is achievable through a missing scope enforcement check in the grav-plugin-api Composer package before version 1.0.13. Any holder of a low-privilege API key carrying api.users.write permission - or any scoped key on a super account - can POST to /api/v1/users/{user}/2fa/disable without supplying a TOTP code, stripping 2FA from any non-super target account and enabling direct account takeover. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain or compromise API key with api.users.write
Delivery
Enumerate valid non-super Grav username
Exploit
POST /api/v1/users/{user}/2fa/disable without TOTP code
Execution
2FA silently removed from target account
Persist
Authenticate to Grav admin with target's password alone
Impact
Full account takeover achieved
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Vulnerability AssessmentAI

Exploitation The attacker must possess a valid API key meeting one of two criteria: (a) the key is associated with a non-super account whose ACL includes api.users.write permission, or (b) the key is any scoped key associated with a super account, since api_key_scopes caps are never enforced on the disable2fa path regardless of declared scope. … 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/PR:L) reflects network-accessible exploitation requiring only a valid API key with no complexity barriers beyond credential possession. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker holding a narrow-scope API key - obtained through credential theft, a key leaked in a public repository, or insider access - sends a crafted POST request to /api/v1/users/{target_username}/2fa/disable targeting a non-super Grav account. The missing requirePermission() call allows the request to succeed regardless of the key's declared scope, stripping 2FA from the target account without requiring a TOTP code. …
Remediation Upgrade grav-plugin-api to version 1.0.13 or later, which introduces proper requirePermission() enforcement on the disable2fa endpoint, aligning it with the sibling generate2fa endpoint. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Grav CMS instances with API exposure and audit the distribution of delegated API keys across your organization. …

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

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EUVD-2026-58636 vulnerability details – vuln.today
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