CVE-2026-33400CWE-79

Wallos: Stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint

Medium · published March 24, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
21.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00298 · 21.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-24T17:45Z
EPSS history
Timeline
  • 24 MAR 17:45Z
    Wallos: Stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint
    cvelistv5