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CVE-2026-34931— hoppscotch: Improper loopback redirect_uri validation in device-login flow

Quick assessment

Affected
hoppscotch hoppscotch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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，该漏洞源于开放重定向漏洞可能导致令牌泄露和账户接管。

AI Predicted 6.5 Difficulty: Trivial EPSS 0.43% · P35
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I. Basic Information for CVE-2026-34931

Vulnerability Information
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Vulnerability Title
hoppscotch: Improper loopback redirect_uri validation in device-login flow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
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，该漏洞源于开放重定向漏洞可能导致令牌泄露和账户接管。
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-2026-34931

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III. Intelligence Information for CVE-2026-34931

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Vendor Advisories for CVE-2026-34931 (1)

Vendor Pages for CVE-2026-34931 (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-2026-34847 4.7 MEDIUM hoppscotch: Open redirect via `/enter?redirect=`
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-2026-34931

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