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CVE-2026-34847— hoppscotch: Open redirect via `/enter?redirect=`

Quick assessment

Affected
hoppscotch hoppscotch
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hoppscotch是Hoppscotch开源的一个Api开发生态系统。 hoppscotch 2026.3.0之前版本存在输入验证错误漏洞，该漏洞源于/enter页面中的redirect查询参数未经适当验证直接用于构建URL，可能导致DOM型开放重定向。

CVSS 4.7 · Medium EPSS 0.46% · P37

Public Exploits 1

Nuclei · 1 CVE-2026-34847.yaml [template]

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-34847

Vulnerability Information
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Vulnerability Title
hoppscotch: Open redirect via `/enter?redirect=`
Source: CVE Program / CVE List V5
Vulnerability Description
hoppscotch is an open source API development ecosystem. Prior to version 2026.3.0, the /enter page contains a DOM-based open redirect vulnerability. The redirect query parameter is directly used to construct a URL and redirect the user without proper validation. This issue has been patched in version 2026.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Hoppscotch 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hoppscotch是Hoppscotch开源的一个Api开发生态系统。 hoppscotch 2026.3.0之前版本存在输入验证错误漏洞，该漏洞源于/enter页面中的redirect查询参数未经适当验证直接用于构建URL，可能导致DOM型开放重定向。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hoppscotch hoppscotch < 2026.3.0 -

II. Public POCs for CVE-2026-34847

# POC Description Source Link Shenlong Link
1 Hoppscotch <= 2026.2.1 is vulnerable to a DOM-based open redirect on the /enter page. The redirect query parameter is passed directly to windowz location.href with no origin validation. Requires one additional query parameter to trigger. Exploited via a crafted URL such as /enter?redirect=evil.com&foo=bar. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34847.yaml POC Details
2 Appsmith <= v1.97 instance management API endpoints are accessible without authentication, allowing an attacker to obtain sensitive information such as license plan, instance ID, authentication providers, feature flags, and configuration metadata via unauthenticated requests to specific API endpoints. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/appsmith/appsmith-info-disclosure.yaml POC Details
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III. Intelligence Information for CVE-2026-34847

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Vendor Advisories for CVE-2026-34847 (1)

Vendor Pages for CVE-2026-34847 (1)

Same Patch Batch · hoppscotch · 2026-04-02 · 4 CVEs total

CVE-2026-34848 5.4 MEDIUM hoppscotch: Stored XSS in team member overflow tooltip via display name
CVE-2026-34931 hoppscotch: Improper loopback redirect_uri validation in device-login flow
CVE-2026-34932 hoppscotch: Stored XSS via mock server responses on backend origin

IV. Related Vulnerabilities

Same product: hoppscotch
Same vendor: hoppscotch
Same weakness: CWE-601

V. Comments for CVE-2026-34847

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