CVE-2026-56215: Capgo - Account Merge via Poisoned public.users.email in SSO Provisioning

Severity: high (CVSS 8.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-20 · updated 2026-06-24
Weakness: CWE-639

Description

Capgo before 12.128.12 allows authenticated users to modify their mutable public.users.email to arbitrary addresses, which the SSO provisioning endpoint trusts as an account-merge key. Attackers can pre-position their account with a victim's corporate SSO email, causing the provision-user endpoint to merge the victim's SSO identity into the attacker-controlled account.

Affected products

Capgo: before 12.128.12 — fixed in 12.128.12

How to fix

Upgrade to a fixed version: Capgo 12.128.12. Check the vendor advisory for mitigations.

References

https://github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww
https://www.vulncheck.com/advisories/capgo-account-merge-via-poisoned-public-users-email-in-sso-provisioning
https://github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww

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