XSS in Ellite Wallos
CVE-2026-33400
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Ellite Wallos — versions < 4.7.0
- Wallosapp Wallos
Weakness classification (CWE)
References
- github.com/ellite/Wallos/security/advisories/GHSA-p6v5-227f-f3fv (Exploit, Vendor Advisory)
- github.com/ellite/Wallos/commit/e87387f0ebb540cd33e6dfda7181db9db650ecef (Patch)
Frequently asked questions
- What is CVE-2026-33400?
- CVE-2026-33400 is a medium-severity vulnerability in Ellite Wallos, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-24.
- How severe is CVE-2026-33400?
- Medium severity. CVSS v3 base score is 5.4 out of 10.