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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.

Wallos 是一款开源、可自托管的个人订阅追踪工具。在 5.0.0 版本之前，Wallos 允许任何已认证用户在个人邮件通知设置中存储任意的 SMTP 主机地址——包括私有网络地址和云元数据 IP 地址——且未进行服务端 SSRF（服务器端请求伪造）验证。当计划任务（cron）触发通知时，该存储的主机地址会被直接传递给 PHPMailer，导致 Wallos 服务器向攻击者指定的地址发起出站 TCP 连接。这使得低权限攻击者能够以服务器视角探测内网服务。该问题已在 5.0.0 版本中修复。

CVSS 3.5 · Low
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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

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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Other References for CVE-2026-77351 (3)

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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