Cross-Organization SSO Account Disruption via Prelink Endpoint

Capgo before 12.128.2 contains a cross-organization account disruption vulnerability in the SSO prelink endpoint that allows enterprise administrators to delete password identities of users in foreign organizations. Attackers with org.update_settings permission and an active SSO provider can call the prelink-users endpoint to permanently remove email-based authentication for any user matching the provider's email domain, forcing victims to use the attacker's SSO provider or complete password reset recovery.

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

Capgo versions before 12.128.2 suffer from a critical authorization flaw in their Single Sign-On (SSO) prelink endpoint that enables cross-organization account sabotage. Enterprise administrators possessing org.update_settings permissions can exploit this vulnerability to permanently delete password-based authentication identities for users in completely separate organizations—provided those users' email domains match the attacker's configured SSO provider. This attack forces victims into a devastating position: authenticate through the attacker's controlled SSO provider or undergo forced password resets, effectively locking legitimate users out of their accounts. Any organization using Capgo's SSO functionality is at risk, particularly those in multi-tenant environments where SSO providers span multiple organizational boundaries.

Capgo's 283 mapped security skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK's Persistence (TA0004) and Credential Access (TA0006) tactics. Practitioners using Casky would identify suspicious prelink-users endpoint calls originating from administrators with org.update_settings permissions targeting users outside their own organization, combined with bulk identity deletion patterns across foreign org namespaces. The platform's skill mapping would flag unauthorized SSO provider configuration changes paired with subsequent authentication failures for users matching external email domains—revealing the distinctive forensic signature of cross-org account disruption attempts before widespread impact 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-2026-56313.

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-2026-56313

Casky has 283 skills that investigate the attack patterns behind CVE-2026-56313. Run one and get CVSS-scored findings in 3 minutes.

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