CVE-2026-34931 PUBLISHED

hoppscotch: Improper loopback redirect_uri validation in device-login flow

Assigner: GitHub_M
Reserved: 31.03.2026 Published: 02.04.2026 Updated: 03.04.2026

hoppscotch is an open source API development ecosystem. Prior to version 2026.3.0, there is an open redirect vulnerability that leads to token exfiltration. With these tokens, the attacker can sign in as the victim to takeover their account. This issue has been patched in version 2026.3.0.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 8.5

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Active

CVSS 4.0

Product Status

Vendor	hoppscotch
Product	hoppscotch
Versions	Version < 2026.3.0 is affected

References

Problem Types

CWE-601: URL Redirection to Untrusted Site ('Open Redirect') CWE