hoppscotch: Improper loopback redirect_uri validation in device-login flow
Priority HIGH 72CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-601.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0038 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed hoppscotch (hoppscotch): 2026.3.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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-2026-34931
References
More Hoppscotch vulnerabilities
- 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-2026-22551 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
- TI-2026-22550 hoppscotch Vulnerable to Unauthenticated Onboarding Config Takeover CVSS 3.1CRITICAL 9.1
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences