CVE-2026-34931 hoppscotch: Improper loopback redirect_uri validation in device-login flow
An open redirect in the device-login flow allows attackers to exfiltrate tokens and take over victim accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-34931?
CVE-2026-34931 is a high-severity vulnerability in hoppscotch, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-34931?
It affects 1 product.
Products include Hoppscotch Hoppscotch.
How do I fix CVE-2026-34931?
No fix has been published for CVE-2026-34931 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-34931 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34931 exists.
Other vulnerabilities in hoppscotch
- CVE-2026-50160 Mass Assignment via Onboarding Endpoint Allows Unauthenticated JWT_SECRET Overwrite
- CVE-2026-28215 hoppscotch Vulnerable to Unauthenticated Onboarding Config Takeover
- CVE-2026-34932 hoppscotch: Stored XSS via mock server responses on backend origin
- CVE-2026-28216 hoppscotch has IDOR in updateUserEnvironment / deleteUserEnvironment
- CVE-2022-0121 Cross-site Scripting in hoppscotch/hoppscotch
Sources
Also known as GHSA-7fg7-wx5q-6m3v.