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CVE-2026-77351— Wallos: SSRF via Unvalidated User-Level SMTP Host in Email Notification Settings

Quick assessment

Affected
ellite Wallos
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.

Miguel Ribeiro Wallos是Miguel Ribeiro个人开发者开源的一个开源个人订阅跟踪器。 Miguel Ribeiro Wallos 5.0.0之前版本存在服务端请求伪造漏洞，该漏洞源于缺少服务端SSRF验证，允许已认证用户存储任意SMTP主机（包括私有和云元数据IP地址），导致服务器向攻击者指定地址发起出站TCP连接，使低权限攻击者能够探测内部网络服务。

CVSS 3.5 · Low EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
ellite Wallos < 5.0.0 affected
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I. Basic Information for CVE-2026-77351

Vulnerability Information
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Vulnerability Title
Wallos: SSRF via Unvalidated User-Level SMTP Host in Email Notification Settings
Source: CVE Program / CVE List V5
Vulnerability Description
Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 5.0.0, Wallos lets any authenticated user store an arbitrary SMTP host — including private and cloud-metadata IP addresses — in their personal email notification settings, with no server-side SSRF validation. When the scheduled notification cron job runs, it passes the stored host directly to PHPMailer, causing the Wallos server to open an outbound TCP connection to whatever address the attacker specified. This gives a low-privileged attacker a reliable mechanism to probe internal network services from the server's perspective. This issue has been patched in version 5.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Miguel Ribeiro Wallos 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Miguel Ribeiro Wallos是Miguel Ribeiro个人开发者开源的一个开源个人订阅跟踪器。 Miguel Ribeiro Wallos 5.0.0之前版本存在服务端请求伪造漏洞，该漏洞源于缺少服务端SSRF验证，允许已认证用户存储任意SMTP主机（包括私有和云元数据IP地址），导致服务器向攻击者指定地址发起出站TCP连接，使低权限攻击者能够探测内部网络服务。
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
ellite Wallos < 5.0.0 -

II. Public POCs for CVE-2026-77351

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III. Intelligence Information for CVE-2026-77351

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Patches & Fixes for CVE-2026-77351 (1)

Vendor Advisories for CVE-2026-77351 (1)

Vendor Pages for CVE-2026-77351 (1)

Same Patch Batch · ellite · 2026-08-31 · 13 CVEs total

CVE-2026-61640 8.5 HIGH Wallos: SSRF via OIDC Token/UserInfo URL Configuration
CVE-2026-61639 8.5 HIGH Wallos: Zip Slip path traversal in database restore writes files to webroot
CVE-2026-54600 8.2 HIGH Wallos: Unauthenticated database replacement via import endpoint on fresh install
CVE-2026-61638 8.2 HIGH Wallos: SSRF via Test Email Notification - unvalidated SMTP host/port
CVE-2026-77348 8.2 HIGH Wallos incomplete fix for CVE-2026-33407: unauthenticated httpoxy SSRF still reachable via
CVE-2026-61641 8.1 HIGH Wallos: OIDC account takeover via email-based account linking without `email_verified` che
CVE-2026-54598 7.5 HIGH Missing Authentication for Critical Function in wallos
CVE-2026-54599 7.5 HIGH Wallos: OIDC state parameter never validated — login CSRF / account takeover
CVE-2026-77353 4.6 MEDIUM Wallos: iCalendar Injection via CRLF in Subscription Name/Notes Export
CVE-2026-50199 4.3 MEDIUM Wallos: Cross-user Fixer/API Layer credential consumption in exchange-rate refresh
CVE-2026-50198 4.3 MEDIUM Wallos: Cross-user subscription cost inference via replacement_subscription_id
CVE-2026-77352 4.3 MEDIUM Wallos: Authenticated SSRF via per-user SMTP notification host (low-privilege user)

IV. Related Vulnerabilities

Same product: Wallos
Same vendor: ellite
Same weakness: CWE-918

V. Comments for CVE-2026-77351

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