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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.

PUBLISHED Reserved 2026-06-19 | Published 2026-06-20 | Updated 2026-06-20 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
HIGH: 8.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Problem types

Authorization Bypass Through User-Controlled Key

Product status

Default status
unaffected

Any version before 12.128.12
affected

12.128.12 (semver)
unaffected

Credits

Judel777 reporter

References

github.com/.../capgo/security/advisories/GHSA-wqc6-fhwf-qpww (GHSA Advisory GHSA-wqc6-fhwf-qpww) vendor-advisory

www.vulncheck.com/...-public-users-email-in-sso-provisioning (VulnCheck Advisory: Capgo - Account Merge via Poisoned public.users.email in SSO Provisioning) third-party-advisory

cve.org (CVE-2026-56215)

nvd.nist.gov (CVE-2026-56215)

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