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CVE-2026-61638— Wallos: SSRF via Test Email Notification - unvalidated SMTP host/port

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。在版本 4.9.6 之前，POST 请求 会从 POST 请求体中接受 和 参数，且未进行任何 SSRF（服务端请求伪造）验证。随后 PHPMailer 会连接到攻击者指定的主机:端口。其他所有通知端点均使用了 进行 SSRF 防护，但邮件通知端点被遗漏。任何已认证的用户均可利用此漏洞探测内部网络及云元数据服务。该问题已在版本 4.9.6 中修复。

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery
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I. Basic Information for CVE-2026-61638

Vulnerability Information
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Vulnerability Title
Wallos: SSRF via Test Email Notification - unvalidated SMTP host/port
Source: CVE Program / CVE List V5
Vulnerability Description
Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.6, POST /endpoints/notifications/testemailnotifications.php accepts smtpaddress and smtpport from POST body with zero SSRF validation. PHPMailer connects to attacker-supplied host:port. Every other notification endpoint uses ssrf_helper.php but email was missed. Any authenticated user can probe internal network, cloud metadata. This issue has been patched in version 4.9.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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 < 4.9.6 -

II. Public POCs for CVE-2026-61638

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III. Intelligence Information for CVE-2026-61638

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Other References for CVE-2026-61638 (3)

Same Patch Batch · ellite · 2026-08-31 · 9 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-2026-61641 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-2026-50199 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

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-61638

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