CVE-2026-34931CWE-601

hoppscotch: Improper loopback redirect_uri validation in device-login flow

High · published April 2, 2026

CVSS v4.0
8.5
EPSS
0%
Percentile
36.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.5 · HIGH
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
EPSS
0.00432 · 36.5th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2026-04-02T19:21Z
EPSS history
Timeline
  • 02 APR 19:21Z
    hoppscotch: Improper loopback redirect_uri validation in device-login flow
    cvelistv5