Vulnerability · Published Jun 20, 2026 · Assigned by VulnCheck

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

High 8.3

In plain English

A high-severity authorization bypass via user-controlled key in Capgo from Capgo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.4%top 66.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Capgo	Capgo	0 – before 12.128.12

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

References

GHSA Advisory GHSA-wqc6-fhwf-qpww vendor-advisory
VulnCheck Advisory: Capgo - Account Merge via Poisoned public.users.email in SSO Provisioning third-party-advisory