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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.

Wallos 是一个开源、可自托管的个人订阅跟踪工具。在 4.9.1 版本之前，已认证的用户可以编辑自己的非活跃（inactive）订阅，并将 设置为属于其他用户的订阅 ID。系统会接受该写入操作，但后续的统计逻辑在引用这个外部的订阅 ID 时，并未进行 的范围限定。这使得攻击者能够通过观察自身统计数据的变化，推断出目标用户订阅的月度归一化成本。虽然该漏洞不会暴露目标用户订阅的完整对象，但会泄露一些衍生的财务元数据。此问题已在 4.9.1 版本中修复。

CVSS 4.3 · Medium EPSS 0.03% · P9

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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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

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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Other References for CVE-2026-50198 (2)

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-2026-61638 8.2 HIGH Wallos: SSRF via Test Email Notification - unvalidated SMTP host/port
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

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-50198

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