CVE-2026-13163

The record

Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c/<token>/) in Mailerup <1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid signed token is not required.

Affected packages

Related vulnerabilities

• CVE-2026-87945 URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal SAML SSO… CWE-601
• CVE-2026-87937 URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central… CWE-601
• CVE-2026-112034 A weakness has been identified in aircheng-org iWebShop-5 up to 5.16. CWE-601
• CVE-2026-101907 Axios is a promise-based HTTP client for the browser and Node.js. CWE-601
• CVE-2026-8323 URL redirection to untrusted site ('open redirect') vulnerability in Armiya Information… CWE-601
• CVE-2026-78377 URL redirection to untrusted site ('open redirect') vulnerability in Yordam Informatics… CWE-601
• CVE-2026-81741 The Groundhogg — CRM, Newsletters, and Marketing Automation WordPress plugin before 4.7.2… CWE-601
• CVE-2026-84389 A url redirection to untrusted site ('open redirect') vulnerability in Fortinet FortiSIEM… CWE-601