CVE-2026-13163
Lack of input validation in Mailerup input parameter leads to Open Redirect
Description
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.
INFO
Published Date :
June 24, 2026, 12:49 p.m.
Last Modified :
June 24, 2026, 12:49 p.m.
Remotely Exploit :
Yes !
Source :
Secur0
Affected Products
The following products are affected by CVE-2026-13163
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 4daa8cea-433a-44bd-9456-53b127fc289a | ||||
| CVSS 4.0 | MEDIUM | 4daa8cea-433a-44bd-9456-53b127fc289a |
Solution
- Update Mailerup to the latest version.
- Restrict destination hosts to an allowlist.
- Implement robust URL validation.
- Ensure exceptions are not silently caught.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-13163 vulnerability anywhere in the article.