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
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
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess a valid authenticated Capgo session - a live session cookie or an authenticated browser (PR:L) - because the vulnerable email-change endpoint accepts the change based solely on that session, with no current-password prompt and no confirmation sent to the existing email. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N) scores 8.4 (High) and is internally consistent with the description: network reachable, low complexity, but requiring existing low-privilege authenticated access (PR:L) and some active interaction (UI:A). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker obtains a victim's Capgo session - for example a cookie exfiltrated via XSS or captured on a shared/unlocked device - and, without knowing the password, submits an email-change request that the endpoint accepts with no re-authentication or old-email confirmation. The attacker then triggers a password reset to the newly controlled address and resets MFA, locking out the legitimate owner and taking full control of the account. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all systems for Capgo deployments and identify current versions; confirm whether any instances are running versions before 12.128.2. …
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Same technique Authentication Bypass
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External POC / Exploit Code
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