CVE-2026-34932: hoppscotch: Stored XSS via mock server responses on backend origin

Severity: critical (CVSS 9.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-07-24
Weakness: CWE-79

Description

hoppscotch is an open source API development ecosystem. Prior to version 2026.3.0, there is a stored XSS vulnerability that can lead to CSRF. This issue has been patched in version 2026.3.0.

Affected products

hoppscotch: before 2026.3.0 — fixed in 2026.3.0

How to fix

Upgrade to a fixed version: hoppscotch 2026.3.0. Check the vendor advisory for mitigations.

References

https://github.com/hoppscotch/hoppscotch/releases/tag/2026.3.0
https://github.com/hoppscotch/hoppscotch/security/advisories/GHSA-wj4r-hr4h-g98v

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