Vulnerability · Published Feb 26, 2026 · Assigned by GitHub_M
CVE-2026-28215hoppscotch Vulnerable to Unauthenticated Onboarding Config Takeover
Critical 9.1
In plain English
A critical-severity improper access control in hoppscotch from hoppscotch. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| hoppscotch | hoppscotch | < 2026.2.0 |
Weakness: CWE-284, CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-jwv8-867r-q9fg x_refsource_CONFIRM
- https://github.com/hoppscotch/hoppscotch/releases/tag/2026.2.0 x_refsource_MISC