Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user (CVE-2026-56223) | HOL Guard CVE

High · CVSS 8.7CVE-2026-56223

Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user

Answer in brief

CVE-2026-56223 records a High severity (CVSS 8.7) vulnerability in Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user. The current sources do not mark it as known exploited. The current feed maps Capgo/Capgo (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 24, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Jun 24, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Capgo/Capgo (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Capgo/Capgogeneric	>=0 <12.128.2	12.128.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for Capgo/Capgo.
Review the reported fix. Update Capgo/Capgo to 12.128.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 24, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.