Hoppscotch is an open source API development ecosystem. Prior to 2026.6.0, the team, teamMembers.user, RESTHistory, GQLHistory, currentRESTSession, currentGQLSession, environments, globalEnvironments, and settings GraphQL paths expose another workspace member's private User data, while toggleHistoryStarStatus and removeRequestFromHistory in the UserHistory service accept another user's history identifier without enforcing userUid ownership, allowing an authenticated workspace member to read private request history, session data, request contents, authorization headers, environment values, and settings and to modify or delete the victim's private history entries. This issue is fixed in version 2026.6.0.

hoppscotch is an open source API development ecosystem. Prior to version 2026.2.1, the DELETE /v1/access-tokens/revoke endpoint allows any authenticated user to delete any other user's PAT by providing its ID, with no ownership verification. This issue has been patched in version 2026.2.1.

Hoppscotch is an API development ecosystem. Due to lack of validation for fields like Label (Edit Team) - TeamName, bad actors can send emails with Spoofed Content as Hoppscotch. Part of payload (external link) is presented in clickable form - easier to achieve own goals by malicious actors. This issue is fixed in 2023.12.6.