CVE-2026-50160: hoppscotch — Exploit & Fix

Description

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.

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CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0860

Probability of exploitation

0.95%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-915 CWE-915

Affected Products

Vendor	Product	Versions
hoppscotch	hoppscotch	< 2026.5.0

References

Advisories & Patches

https://github.com/hoppscotch/hoppscotch/pull/6171 https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-j542-4rch-8hwf https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-j542-4rch-8hwf

Exploits

https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-j542-4rch-8hwf http://www.openwall.com/lists/oss-security/2026/06/23/7 https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-j542-4rch-8hwf

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-50160? +

CVE-2026-50160 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0860, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-50160? +

CVE-2026-50160 affects products from hoppscotch, specifically: hoppscotch. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-50160? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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