Auth bypass in Capgo
CVE-2026-56215
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.12
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-wqc6-fhwf-qpww (vendor-advisory)
- www.vulncheck.com/advisories/capgo-account-merge-via-poisoned-public-users-emai… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56215?
- CVE-2026-56215 is a high-severity vulnerability in Capgo, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.3/10. Published 2026-06-20.
- How severe is CVE-2026-56215?
- High severity. CVSS v3 base score is 8.3 out of 10.