CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Tags
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.
Analysis
Open redirect in Hoppscotch API development platform prior to version 2026.3.0 enables token exfiltration leading to complete account takeover. Attackers can craft malicious URLs that redirect authenticated users to attacker-controlled domains, stealing authentication tokens in transit. …
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Remediation
Within 24 hours: Inventory all Hoppscotch installations and document current versions in use; verify if any instances are publicly accessible. Within 7 days: Upgrade all Hoppscotch instances to version 2026.3.0 or later; communicate patch requirement to development teams. …
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External POC / Exploit Code
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EUVD-2026-18538