CVE-2026-33400: Wallosapp Wallos

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.7.0, a stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint allows any authenticated user to inject arbitrary JavaScript that executes when any user visits the Settings, Subscriptions, or Statistics pages. Combined with the wallos_login authentication cookie lacking the HttpOnly flag, this enables full session hijacking. This issue has been patched in version 4.7.0.

Affected products

• Wallosapp Wallos: before 4.7.0 (fixed in 4.7.0)

Published 2026-03-24. Last modified 2026-06-17.