EUVD-2026-18540
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
3Description
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.
Analysis
Stored cross-site scripting (XSS) in Hoppscotch versions prior to 2026.3.0 enables remote attackers to execute arbitrary JavaScript in victim browsers without authentication, potentially escalating to cross-site request forgery (CSRF) attacks against authenticated users. CVSS 8.5 (High) reflects network accessibility with low complexity but user interaction required. …
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Remediation
Within 24 hours: Audit Hoppscotch deployment version and identify all instances running versions prior to 2026.3.0; notify affected development teams to avoid accessing untrusted shared collections. Within 7 days: Implement network-level content security policy (CSP) headers enforcing script-src restrictions and disable inline script execution on Hoppscotch instances; conduct inventory of shared collections for malicious payloads. …
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External POC / Exploit Code
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