TI-2026-27156 Aliases CVE-2026-34932

hoppscotch: Stored XSS via mock server responses on backend origin

LOW 39CWE-79Published 2026-04-02 · Updated 2026-04-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: Active
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00293 22nd percentileScored 2026-11-07

Fix Fixed hoppscotch (hoppscotch): 2026.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
hoppscotch	hoppscotch	before 2026.3.0	2026.3.0	Patch available	CNA

hoppscotch Vendorhoppscotch Affected before 2026.3.0 Fixed in 2026.3.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:hoppscotch:hoppscotch::::::::	before 2026.3.0	Vulnerable	hoppscotch

cpe:2.3:a:hoppscotch:hoppscotch:*:*:*:*:*:*:*:* Versions before 2026.3.0 Vulnerable ·hoppscotch

Remediation

Fix · CNA hoppscotch (hoppscotch) Fixed in 2026.3.0

Timeline

2026-10-02 Threatist record created from CVE-2026-34932

References

Advisory 1

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

Other 1

https://github.com/hoppscotch/hoppscotch/releases/tag/2026.3.0

TI-2026-36924 Mass Assignment via Onboarding Endpoint Allows Unauthenticated JWT_SECRET Overwrite CVSS 3.1CRITICAL 10.0
TI-2023-16943 Database password exposed in logs in hoppscotch CVSS 3.1HIGH 8.8
TI-2026-27155 hoppscotch: Improper loopback redirect_uri validation in device-login flow CVSS 4.0HIGH 8.5
TI-2026-22551 hoppscotch has IDOR in updateUserEnvironment / deleteUserEnvironment CVSS 3.1HIGH 8.3
TI-2026-22552 IDOR in GraphQL userCollection Query Exposes Other Users' Private Collections CVSS 3.1MEDIUM 6.5
TI-2024-17953 Content spoofing - real Hoppscotch emails CVSS 3.1MEDIUM 5.4

See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences