CVE-2026-56215 | Capgo before 12.128.12 allows authenticated users to modify … | CVSS 8.3 HIGH

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.

Metadata

CVE ID: CVE-2026-56215
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-19 21:43 UTC
Published: 2026-06-20 00:14 UTC
Last updated: 2026-06-20 00:14 UTC
Primary CWE: CWE-639
Authorization Bypass Through User-Controlled Key
Vendor / Product: Capgo / Capgo
Sources: cve.org · NVD

Severity & Metrics

8.3 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Affected products (1)

Vendor	Product	Platform	Versions
Capgo	Capgo	—	0 < 12.128.12, 12.128.12

Weakness (CWE)

CWE	Source	Description
CWE-639	cna	Authorization Bypass Through User-Controlled Key

CVSS scores (2)

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

References (2)

GHSA Advisory GHSA-wqc6-fhwf-qpww https://github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww
VulnCheck Advisory: Capgo - Account Merge via Poisoned public.users.email in SSO Provisioning https://www.vulncheck.com/advisories/capgo-account-merge-via-poisoned-public-users-email-in-sso-provisioning