What is CVE-2026-50160?

CVE-2026-50160 is a critical-severity vulnerability in Hoppscotch, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 10.0/10. Published 2026-07-01.

How severe is CVE-2026-50160?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Hoppscotch

CVE-2026-50160

Hoppscotch is an API development ecosystem. In self-hosted deployments of hoppscotch-backend from version 2026.4.1 and earlier, the unauthenticated POST /v1/onboarding/config endpoint is vulnerable to mass assignment. The global NestJS ValidationPipe is configured without whitelist: true, so extra properties on the request body that are not declared in SaveOnboardingConfigRequest are not stripped and are iterated in the service layer as if they were legitimate InfraConfig entries. Because keys such as JWT_SECRET and SESSION_SECRET are valid InfraConfigEnum values and are not explicitly rejected during validation, an unauthenticated attacker who can reach a fresh instance before onboarding completes (or when no users exist) can overwrite these values in the database. Overwriting JWT_SECRET gives the attacker control of the JWT signing key, allowing them to forge tokens for any user, including administrators, and results in full server compromise. The issue is fixed in hoppscotch 2026.5.0.

Vulnerability class: Mass Assignment

Published 2026-07-01 · last modified 2026-07-02.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.017 (76.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Hoppscotch — versions <= 2026.4.1

Weakness classification (CWE)

CWE-915 — Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

github.com/hoppscotch/hoppscotch/security/advisories/GHSA-j542-4rch-8hwf (Exploit, Mitigation, Vendor Advisory)
github.com/hoppscotch/hoppscotch/pull/6171 (Patch, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108 (Exploit, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-50160?: CVE-2026-50160 is a critical-severity vulnerability in Hoppscotch, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 10.0/10. Published 2026-07-01.
How severe is CVE-2026-50160?: Critical severity. CVSS v3 base score is 10.0 out of 10.