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CVE-2026-13163

MEDIUM
5.3
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-13163
State
PUBLISHED
Assigner
Secur0
Reserved
2026-06-24 12:44 UTC
Published
2026-06-24 12:49 UTC
Last updated
2026-06-24 13:07 UTC
Primary CWE
CWE-601
CWE-601 URL redirection to untrusted site ('open redirect')
Vendor / Product
Mailerup / Mailerup
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Mailerup Mailerup — 0 < 1.0.1
Weakness (CWE)
CWESourceDescription
CWE-601 cna CWE-601 URL redirection to untrusted site ('open redirect')
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 4.0 cna 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
References (1)
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