Admin Privilege Escalation via Channel Permission Override Bypass

Cap-go capgo.app fails to validate that principals in channel_permission_overrides belong to the organization, allowing authenticated app/org admins to grant channel permissions to non-member users. Attackers with admin privileges can insert override rows with arbitrary external user UUIDs to grant channel-scoped permissions such as channel.promote_bundle to users outside the organization.

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

Cap-go's capgo.app contains a critical authorization flaw in its channel_permission_overrides mechanism that fails to validate organizational membership before granting permissions. This vulnerability allows authenticated administrators to escalate privileges by inserting override records with arbitrary external user UUIDs, effectively granting channel-scoped permissions to users outside their organization. Any organization using Cap-go with admin users is at risk, as the attack requires only legitimate admin credentials—no additional exploitation steps are needed once an admin account is compromised or a malicious insider gains admin access.

Casky's 283 matching skills leverage Claude's extended reasoning to identify the attack patterns mapped to TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would observe detection signals across multiple skill domains: authorization bypass patterns in API permission validation, anomalous privilege assignment to out-of-org principals, and lateral privilege escalation chains where external users suddenly gain channel administration capabilities. The platform's mapping to CWE-862 (Missing Authorization) would flag overly permissive access control logic, while MITRE technique analysis would correlate suspicious admin API calls—particularly channel_permission_overrides mutations—with unauthorized access grants, enabling security teams to detect both active exploitation and post-compromise persistence attempts before damage escalates.

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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 →

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-2026-100617.

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 TA0006

Investigate the attack patterns behind CVE-2026-100617

Casky has 283 skills that investigate the attack patterns behind CVE-2026-100617. Run one and get CVSS-scored findings in 3 minutes.

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