API Key Authorization Bypass Enables Lateral Credential Tampering

Capgo before 12.128.2 contains an authorization bypass vulnerability in its public API key management handlers (get/put/delete/post). API keys created with mode=all but restricted to a single app via limited_to_apps are only checked for limited_to_orgs and not for limited_to_apps, so an app-scoped key can enumerate, update, and delete sibling API keys belonging to the same account that are outside its declared app scope, enabling tampering with account-level credentials.

Casky was already ahead

This CVE exploits attack patterns that Casky's 224matched 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

Capgo's authorization bypass vulnerability in API key management allows app-scoped API keys to escape their intended restrictions and manipulate sibling credentials. When API keys are created with mode=all but supposedly limited to a single application via limited_to_apps, the platform only validates limited_to_orgs restrictions—completely ignoring the app-scope boundary. This means an attacker with access to an app-scoped API key can enumerate, modify, and delete other API keys within the same account, regardless of their intended application boundaries. This affects any organization using Capgo for API credential management, particularly those relying on multi-app architectures where app isolation is a critical security control. With a CVSS score of 8.3, this vulnerability enables account-level privilege escalation and lateral movement through credential tampering.

Casky's 224 matching skills detect this vulnerability pattern by mapping to MITRE ATT&CK technique TA0004 (Privilege Escalation) and analyzing authorization enforcement gaps across API handlers. Practitioners using Casky would identify findings showing: (1) API requests succeeding despite app-scope mismatches, indicating missing validation logic in get/put/delete/post handlers; (2) privilege escalation attempts where lower-privileged API keys access resources outside their declared scope; (3) anomalous credential manipulation activity where a single app-scoped key modifies organization-level or sibling-app credentials. Claude's extended reasoning across these 224 security skills enables detection of the root cause—incomplete authorization checks that validate one restriction dimension (limited_to_orgs) while ignoring another (limited_to_apps)—allowing practitioners to prioritize remediation before credentials become a lateral movement vector.

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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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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

224 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-56225.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004

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