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CVE-2026-13163— Lack of input validation in Mailerup input parameter leads to Open Redirect

Quick assessment

Affected
Mailerup Mailerup
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.

Mario MailerUp是Mario个人开发者的一款邮件服务器软件。 Mario MailerUp 1.0.0之前版本存在输入验证错误漏洞，该漏洞源于_safe_redirect函数中的点击跟踪端点存在开放重定向问题，URL方案被验证但目标主机未限制在白名单中，且BadSignature异常被静默捕获，无需有效签名令牌，可能导致远程未经过身份验证的攻击者通过特制的u查询参数实施开放重定向和钓鱼攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mailerup Mailerup < 1.0.1 affected
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I. Basic Information for CVE-2026-13163

Vulnerability Information
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Vulnerability Title
Lack of input validation in Mailerup input parameter leads to Open Redirect
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
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
Mario MailerUp 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mario MailerUp是Mario个人开发者的一款邮件服务器软件。 Mario MailerUp 1.0.0之前版本存在输入验证错误漏洞，该漏洞源于_safe_redirect函数中的点击跟踪端点存在开放重定向问题，URL方案被验证但目标主机未限制在白名单中，且BadSignature异常被静默捕获，无需有效签名令牌，可能导致远程未经过身份验证的攻击者通过特制的u查询参数实施开放重定向和钓鱼攻击。
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
Mailerup Mailerup 0 ~ 1.0.1 -

II. Public POCs for CVE-2026-13163

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III. Intelligence Information for CVE-2026-13163

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Patches & Fixes for CVE-2026-13163 (1)

IV. Related Vulnerabilities

Same product: Mailerup
Same vendor: Mailerup
Same weakness: CWE-601

V. Comments for CVE-2026-13163

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