NVD

CVE-2026-56223 Detail

Received

This CVE record has recently been published to the CVE List and has been included within the NVD dataset.

Description

Capgo before 12.128.2 contains a cross-domain SSO account takeover vulnerability in the provision-user endpoint that allows attackers to merge arbitrary victim accounts based on email match without validating SSO provider domain authorization. An attacker with enterprise org admin access and a malicious IdP can forge SAML assertions containing victim email addresses to trigger account merge and gain full access to victim accounts, organizations, and data.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: VulnCheck

CVSS-B 9.3 CRITICAL

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS 3.x Severity and Vector Strings:

CNA: VulnCheck

Base Score: 8.7 HIGH

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg	CISA-ADP, VulnCheck
https://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user	VulnCheck

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	VulnCheck

Change History

2 change records found show changes

New CVE Received from VulnCheck 6/24/2026 9:16:33 AM

Action	Type	New Value
Added	Description	Capgo before 12.128.2 contains a cross-domain SSO account takeover vulnerability in the provision-user endpoint that allows attackers to merge arbitrary victim accounts based on email match without validating SSO provider domain authorization. An attacker with enterprise org admin access and a malicious IdP can forge SAML assertions containing victim email addresses to trigger account merge and gain full access to victim accounts, organizations, and data.
Added	CVSS V4.0	AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Added	CVSS V3.1	AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Added	CWE	CWE-287
Added	Reference	https://github.com/Cap-go/capgo/security/advisories/GHSA-jhjh-vp9p-54fg
Added	Reference	https://www.vulncheck.com/advisories/capgo-account-takeover-via-cross-domain-sso-email-assertion-in-provision-user
Added	Affected	[{"vendor":"Capgo","product":"Capgo","defaultStatus":"unaffected","packageURL":"pkg:npm/capgo-app","versions":[{"version":"0","lessThan":"12.128.2","versionType":"semver","status":"affected"},{"version":"12.128.2","versionType":"semver","status":"unaffected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-56223
NVD Published Date:
06/24/2026
NVD Last Modified:
06/24/2026
Source:
VulnCheck

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Information Technology Laboratory

National Vulnerability Database