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Grav CMS CVE-2026-76839

| EUVDEUVD-2026-65219 HIGH
Insufficiently Protected Credentials (CWE-522)
2026-08-25 VulnCheck GHSA-8vp7-8q4w-vv7m
Authentication Bypass 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:N/UI:N/VC:H/VI:N/VA:N/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
6.5 MEDIUM

Requires authenticated page-edit access (PR:L); network-reachable CMS endpoint (AV:N); no integrity or availability impact; full confidentiality loss via credential extraction.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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:N/VA:N/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 25, 2026 - 03:16 EUVD
Analysis Generated
Aug 25, 2026 - 02:26 vuln.today
CVE Published
Aug 25, 2026 - 01:30 cve.org
HIGH 8.7

DescriptionCVE.org

Grav before 2.0.16 allows sandboxed Twig templates to access sensitive User fields through allow-listed offsetGet() and offsetexists() methods that lack field filtering. Attackers with page-edit permissions can call offsetGet() on User objects to extract hashed passwords and 2FA secrets, enabling offline password cracking and authentication bypass.

AnalysisAI

Credential extraction in Grav CMS before 2.0.16 allows authenticated users with page-edit permissions to read hashed passwords and two-factor authentication secrets from User objects via insufficiently filtered Twig template sandbox methods. The allow-listed offsetGet() and offsetExists() methods on User objects expose sensitive fields that should be restricted within the sandboxed template context, enabling offline password cracking and subsequent authentication bypass. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with page-edit account
Delivery
Edit or create Grav page with malicious Twig template
Exploit
Call offsetGet('password') on target User object
Execution
Capture hashed credential and 2FA secret from rendered output
Persist
Crack password hash offline
Impact
Log in as victim user bypassing 2FA
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated session with page-edit permissions in the Grav CMS - this is not a default anonymous or low-privilege role but a content-authoring role that must be explicitly granted by an administrator. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N, score 8.7) conflicts directly with the CVE description, which states exploitation requires page-edit permissions - a non-default, authenticated role. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a legitimate or compromised Grav account holding page-edit permissions creates or edits a page containing a malicious Twig template that calls offsetGet('password') or offsetGet('twofa_secret') on the current or target User object. The sandboxed template renders the sensitive field values, which the attacker captures via the page output. …
Remediation Upgrade Grav to version 2.0.16 or later, which applies field-level filtering to the allow-listed offsetGet() and offsetExists() methods in the Twig sandbox, preventing access to sensitive User fields. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Grav CMS installations to identify versions running before 2.0.16 and document which user accounts hold page-editing permissions to determine exposure scope. …

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CVE-2026-76839 vulnerability details – vuln.today
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