CVE-2026-50198: CWE-639: Authorization Bypass Through User-Controlled Key in ellite Wallos
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.
CVSS v3.1
Score 4.3medium
Affected software
ellite
Wallos
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Wallos versions prior to 4.9.1 contain an authorization bypass vulnerability (CWE-639) where an authenticated user can edit their inactive subscription's replacement_subscription_id to point to another user's subscription ID. The system accepts this write without proper user_id scoping, causing the stats logic to dereference the foreign subscription ID. This leads to exposure of derived financial metadata (monthly-normalized cost) of the victim's subscription through the attacker's stats output. The vulnerability does not disclose the full subscription object. The flaw has been patched in version 4.9.1.
Potential Impact
An attacker with authenticated access can infer sensitive financial metadata about other users' subscriptions, specifically the monthly-normalized cost, without full access to the subscription data. This could lead to privacy violations and unauthorized disclosure of financial information. There is no impact on data integrity or availability reported.
Mitigation Recommendations
This vulnerability has been patched in Wallos version 4.9.1. Users and administrators should upgrade to version 4.9.1 or later to remediate this issue. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-03T22:05:13.645Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a95e616acd9273b498f36f0
Added to database: 08/31/2026, 20:37:42 UTC
Last enriched: 09/07/2026, 14:32:18 UTC
Last updated: 10/16/2026, 18:48:21 UTC
Views: 85
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