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Grav CMS EUVDEUVD-2026-42950

| CVE-2026-59190 HIGH
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-07-10 GitHub_M
Authentication Bypass Grav
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) 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
8.8 HIGH

Network-reachable admin endpoint with low complexity and no user interaction; PR:L because a valid admin.users account is required, and full super-admin compromise yields high C/I/A.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/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 (GitHub_M).

CVSS VectorVendor: GitHub_M

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

1
Analysis Generated
Jul 10, 2026 - 17:33 vuln.today

DescriptionCVE.org

grav-plugin-admin is an HTML user interface that provides a way to configure Grav and create and modify pages. In 1.10.52 and earlier, an authenticated attacker with admin.users permission can change the password of any user account, including the super administrator, by sending a direct POST request to /admin/user/{username}?task=save with data[password] because saveUser authorizes the caller's user-management permission but does not verify whether the caller may edit the target user. This issue is expected to be fixed in version 1.10.53.

AnalysisAI

{username}?task=save with data[password]. The saveUser handler checks that the caller has user-management rights but never verifies the caller is allowed to edit that specific target, an authorization gap (CWE-639) carrying a CVSS 4.0 score of 8.7. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as admin.users-privileged account
Delivery
POST to /admin/user/admin?task=save with data[password]
Exploit
saveUser skips target authorization check
Execution
Super-admin password overwritten
Persist
Log in as super administrator
Impact
Full CMS takeover
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated Grav admin session whose role carries the admin.users permission (CVSS PR:L); the attacker does not need to be the super administrator or to have edit rights over the target account - that missing object-level check is precisely the bug. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine priority for any multi-user Grav deployment, though its blast radius is bounded by a precondition. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A company delegates day-to-day account management to a junior 'user manager' account that has only the admin.users permission and no super-admin rights. That user (or an attacker who has phished the manager's credentials) sends a single POST to /admin/user/admin?task=save with data[password]=NewPass!, silently overwriting the super administrator's password, then logs in as the super admin to take full control of the CMS. …
Remediation Upgrade grav-plugin-admin to version 1.10.53, the release expected to fix this issue, once it is published; the upstream fix is available as commit 88f7ce8e50324472f492965caa42fb709a4f791a and is described in advisory GHSA-p97c-g455-q447 (https://github.com/getgrav/grav/security/advisories/GHSA-p97c-g455-q447). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all accounts granted user-management privileges; revoke access for any accounts no longer requiring it; enable detailed logging of user modification requests. …

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EUVD-2026-42950 vulnerability details – vuln.today
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