What is CVE-2026-34931?

CVE-2026-34931 is a critical-severity vulnerability in Hoppscotch, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.6/10. Published 2026-04-02.

How severe is CVE-2026-34931?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Open Redirect in Hoppscotch

CVE-2026-34931

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 accoun…

Vulnerability class: Open Redirect

EPSS: 0.004 (29.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Hoppscotch — versions < 2026.3.0

Weakness classification (CWE)

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

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-34931?: CVE-2026-34931 is a critical-severity vulnerability in Hoppscotch, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 9.6/10. Published 2026-04-02.
How severe is CVE-2026-34931?: Critical severity. CVSS v3 base score is 9.6 out of 10.