Add Keycloak reset credentials flow account takeover module (CVE-2026-18963) - #21851
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Add Keycloak reset credentials flow account takeover module (CVE-2026-18963)#21851M4xSec wants to merge 1 commit into
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Adds auxiliary/admin/http module for CVE-2026-18963. Keycloak 26.7.0 and 26.7.1 ship a broken "try another way" credential selector in the reset-credentials (Forgot Password) flow. The selector stores an authentication session note that is not scoped to the current authenticator execution, so an attacker can drive the email reset authenticator to success without ever submitting the one-time token that Keycloak mailed to the account owner. The flow then advances to the update-password screen, letting an unauthenticated attacker set a new password for any account in a realm that has Forgot Password enabled. Fixed in Keycloak 26.7.2. Tested against Keycloak 26.7.1. Signed-off-by: venexy <predator0x300@gmail.com>
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Summary
Auxiliary module for CVE-2026-18963. Keycloak 26.7.0 and 26.7.1 ship a broken
"try another way" credential selector in the reset-credentials (Forgot Password)
flow. The selector stores an authentication-session note that is not scoped to the
current authenticator execution, so an attacker can drive the email reset
authenticator to
success()without ever submitting the one-time token Keycloakmailed to the account owner. The flow then advances to the update-password screen,
letting an unauthenticated attacker set a new password for any account in a realm
that has Forgot Password enabled.
Version is not disclosed over HTTP, so
checkconfirms the reset-credentials flowis reachable rather than fingerprinting a build;
runproves the finding by settinga password and logging in with it.
Fixed in Keycloak 26.7.2.
Verification
use auxiliary/admin/http/keycloak_reset_credentials_atoset RHOSTS,REALM,VICTIMcheckreports the reset-credentials flow is enabledrunTested against Keycloak 26.7.1.