GHSA-65p7-pjj8-ggmr Member account takeover

• npm ghost: >= 3.18.0, < 3.42.6 → fixed in 3.42.6 • npm ghost: >= 4.0.0, < 4.15.1 → fixed in 4.15.1

Impact An error in the implementation of the member email change functionality allows unauthenticated users to change the email address of arbitrary member accounts to one they control by crafting a request to the relevant API endpoint, and validating the new address via magic link sent to the new email address. Ghost(Pro) has already been patched. Self-hosters are impacted if running Ghost a version between 3.18.0 and 4.15.0 with members functionality enabled. Patches Fixed in 4.15.1, all 4.x sites should upgrade as soon as possible. Fixed in 3.42.6, all 3.x sites should upgrade as soon as possible. Workarounds The patch in 4.15.1 and 3.42.6 adds a new authenticated endpoint for updating member email addresses. Updating Ghost is the quickest complete solution. As a workaround, if for any reason you cannot update your Ghost instance, you can block the `POST /members/api/send-magic-link/` endpoint, which will also disable member login and signup for your site. For more information If you have any questions or comments about this advisory: • Email us at [email protected]