API Key Scope Bypass Enables Unauthorized Twig Processing

The Grav API plugin (getgrav/grav-plugin-api) before 1.0.13 contains an API key scope-cap bypass in PagesController::guardTwigContent(). The Twig-toggle check uses a bare isSuperAdmin() gate that does not consult api_key_scopes, so a least-privilege API key scoped only to api.pages.write and minted on a super account can enable process.twig on a page save even though admin.pages_twig is intentionally outside the api.pages scope. When security.twig_content.process_enabled=true and editor_enabled=false, this allows Twig-in-content to execute server-side, resulting in server-side template injection (SSTI) and remote code execution.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-72824 is a privilege escalation vulnerability in the Grav API plugin that allows attackers with least-privilege API keys to bypass scope restrictions and enable dangerous Twig template processing. The flaw exists in PagesController::guardTwigContent(), where the security check uses a bare isSuperAdmin() gate that ignores the api_key_scopes configuration. An attacker holding a low-privilege API key scoped only to api.pages.write can exploit this to enable process.twig on page saves, gaining capabilities explicitly restricted by the admin.pages_twig scope. This affects Grav installations that expose the API plugin with security.twig_content.process_enabled=true and editor_enabled configurations, potentially allowing remote code execution through Twig template injection when combined with page editing permissions.

Casky's 283 matched security skills leverage Claude AI's extended reasoning to detect the attack patterns mapped to MITRE techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify this vulnerability through detection of authorization logic flaws—specifically the inconsistency between authentication checks (isSuperAdmin) and authorization enforcement (missing api_key_scopes validation). Security findings would highlight API gateway anomalies showing low-privilege keys performing admin-restricted actions, Twig template processing in audit logs from unexpected API accounts, and configuration drift where scope policies don't match implemented gate checks. The platform's skill set would correlate these technical indicators with the underlying access control weakness, enabling teams to detect exploitation attempts before malicious Twig code execution occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-72824.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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