Lago through 1.55.0 Authentication Bypass via acceptInvite GraphQL Mutation

Summary

Lago through 1.55.0 contains an authentication bypass vulnerability that allows organization administrators to obtain session tokens for existing accounts via the acceptInvite mutation without a password check. Attackers can invite a victim's email, accept with an arbitrary password, and receive a JWT to access the victim's organizations, billing data, API keys and payment integrations.

Remediation

1. Inventory every getlago lago deployment, including staging.
2. No fixed version appears in the public sources yet. Check the references below and the vendor directly.

References

• Patchhttps://github.com/getlago/lago-api/commit/5a9d5935b027d1db7171c7c015283d5870451305
• Patchhttps://github.com/getlago/lago-api/pull/6146
• Advisoryhttps://abraxaslabs.tech/research/lago-invite-ato
• Advisoryhttps://www.vulncheck.com/advisories/lago-through-1.55.0-authentication-bypass-via-acceptinvite-graphql-mutation
• Referencehttps://github.com/getlago/lago-api
• Referencehttps://github.com/getlago/lago-api/blob/v1.55.0/app/services/invites/accept_service.rb#L15-L16
• Referencehttps://github.com/getlago/lago-api/blob/v1.55.0/app/services/users_service.rb#L89-L98