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CVE-2026-50198— Wallos: Cross-user subscription cost inference via replacement_subscription_id

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 4.9.1之前版本存在授权问题漏洞，该漏洞源于未对订阅ID进行用户作用域限制，导致已认证用户可编辑自己非活跃订阅并将replacement_subscription_id设置为其他用户的订阅ID，通过观察统计输出推断受害者的月度标准化成本，造成财务元数据泄露。

CVSS 4.3 · Medium EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
ellite Wallos < 4.9.1 affected
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I. Basic Information for CVE-2026-50198

Vulnerability Information
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Vulnerability Title
Wallos: Cross-user subscription cost inference via replacement_subscription_id
Source: CVE Program / CVE List V5
Vulnerability Description
Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.1, an authenticated user can edit their own inactive subscription and set replacement_subscription_id to a subscription ID belonging to another user. The write is accepted, and later the stats logic dereferences that foreign subscription ID without user_id scoping. This lets the attacker infer the victim subscription's monthly-normalized cost by observing changes in their own stats output. This does not expose the full victim subscription object, but it does expose derived financial metadata. This issue has been patched in version 4.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Miguel Ribeiro Wallos 授权问题漏洞
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 4.9.1之前版本存在授权问题漏洞，该漏洞源于未对订阅ID进行用户作用域限制，导致已认证用户可编辑自己非活跃订阅并将replacement_subscription_id设置为其他用户的订阅ID，通过观察统计输出推断受害者的月度标准化成本，造成财务元数据泄露。
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 < 4.9.1 -

II. Public POCs for CVE-2026-50198

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III. Intelligence Information for CVE-2026-50198

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Vendor Advisories for CVE-2026-50198 (1)

Vendor Pages for CVE-2026-50198 (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-2026-77352 4.3 MEDIUM Wallos: Authenticated SSRF via per-user SMTP notification host (low-privilege user)
CVE-2026-77351 3.5 LOW Wallos: SSRF via Unvalidated User-Level SMTP Host in Email Notification Settings

IV. Related Vulnerabilities

Same product: Wallos
Same vendor: ellite
Same weakness: CWE-639

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