CVE-2026-13163 (GCVE-0-2026-13163)

Vulnerability from cvelistv5 – Published: 2026-06-24 12:49 – Updated: 2026-06-24 13:07
VLAI?
Title
Lack of input validation in Mailerup input parameter leads to Open Redirect
Summary
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.
Severity ?
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CWE
  • CWE-601 - URL redirection to untrusted site ('open redirect')
Assigner
References
Impacted products
Vendor Product Version
Mailerup Mailerup Affected: 0 , < 1.0.1 (custom)
Create a notification for this product.
Credits
Dario Rivas Quero from Secur0 security team Cristian Fernandez Cornejo from Secur0 security team Mario Alvarez Fernandez Xoan M. Otero Jorge Secur0 CNA
Show details on NVD website
To clipboard 

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.