CVE-2026-28215 hoppscotch Vulnerable to Unauthenticated Onboarding Config Takeover
Unauthenticated attackers can overwrite self-hosted Hoppscotch configurations, hijacking OAuth credentials and reading stored secrets via an unprotected onboarding endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-28215?
CVE-2026-28215 is a critical missing authorization vulnerability in hoppscotch, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
hoppscotch is an open source API development ecosystem. Prior to version 2026.2.0, an unauthenticated attacker can overwrite the entire infrastructure configuration of a self-hosted Hoppscotch instance including OAuth provider credentials and SMTP settings by sending a single HTTP POST request with no authentication. The endpoint POST /v1/onboarding/config has no authentication guard and performs no check on whether onboarding was already completed. A successful exploit allows the attacker to replace the instance's Google/GitHub/Microsoft OAuth application credentials with their own, causing all subsequent user logins via SSO to authenticate against the attacker's OAuth app. The attacker captures OAuth tokens and email addresses of every user who logs in after the exploit. Additionally, the endpoint returns a recovery token that can be used to read all stored secrets in plaintext, including SMTP passwords and any other configured credentials. Version 2026.2.0 fixes the issue.
Which versions are affected by CVE-2026-28215?
It affects 1 product.
Products include Hoppscotch Hoppscotch.
How do I fix CVE-2026-28215?
No fix has been published for CVE-2026-28215 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-28215 being exploited?
There is no known exploitation of CVE-2026-28215 in the wild and no public exploit code.
Other vulnerabilities in hoppscotch
- CVE-2026-50160 Mass Assignment via Onboarding Endpoint Allows Unauthenticated JWT_SECRET Overwrite
- CVE-2026-34931 hoppscotch: Improper loopback redirect_uri validation in device-login flow
- CVE-2026-34932 hoppscotch: Stored XSS via mock server responses on backend origin
- CVE-2026-28216 hoppscotch has IDOR in updateUserEnvironment / deleteUserEnvironment
- CVE-2022-0121 Cross-site Scripting in hoppscotch/hoppscotch
Sources
Also known as GHSA-jwv8-867r-q9fg.