EUVD-2026-43230
GHSA-gxf7-q22c-vmrj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/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
Requires an existing authenticated session so PR:L; network-reachable endpoint with low complexity; some interaction (UI:R); high confidentiality/integrity impact from account takeover, no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Capgo before 12.128.2 allows email address changes without requiring current password re-authentication or verification of the existing email address. An attacker with access to a valid session cookie or authenticated browser can change the account email to gain control of account recovery and bypass multi-factor authentication protections.
AnalysisAI
Account takeover in Capgo before 12.128.2 arises because the email-change endpoint performs no current-password re-authentication and no verification of the existing email address, letting an attacker who already holds a valid session cookie or an authenticated browser silently repoint the account email. By seizing the recovery address, the attacker captures password-reset flows and sidesteps multi-factor authentication, converting a hijacked session into durable full account control. There is no public exploit identified at time of analysis, but the flaw is vendor-confirmed via GitHub Security Advisory GHSA-9px4-w25f-mvm4 and reported by VulnCheck.
Technical ContextAI
Capgo is a live/over-the-air (OTA) update service and Capacitor plugin used by mobile app developers to ship JavaScript bundle updates to Capacitor-based iOS/Android apps without full app-store releases; the affected component is its web account backend, identified by cpe:2.3:a:capgo:capgo. The root cause is CWE-640 (Weak Password Recovery Mechanism), here manifesting as a missing step-up authentication control on a security-sensitive account mutation. Well-designed account systems treat an email change as a privileged operation gated by re-entry of the current password and/or a confirmation link sent to the OLD email; Capgo omitted both, so the endpoint trusts session authentication alone for an action that redefines the account's root of trust for recovery and MFA reset.
RemediationAI
Vendor-released patch: upgrade Capgo to 12.128.2 or later, which enforces authentication/verification on the email-change flow; see the advisory at https://github.com/Cap-go/capgo/security/advisories/GHSA-9px4-w25f-mvm4. Until patched, reduce session-hijacking exposure and account-recovery abuse: shorten session lifetimes and force re-login for account settings, invalidate/rotate active session cookies (logging users out to cut off any already-stolen sessions, at the cost of user friction), and monitor or alert on email-change events so a changed recovery address can be caught and reversed. Where possible, restrict or manually gate email changes and re-verify identity out-of-band before honoring a change, accepting the operational overhead this adds; also review account-recovery and MFA-reset logs for anomalous activity predating the upgrade.
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Same technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today