Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

CVE-2026-33400Wallos: Stored cross-site scripting (XSS) vulnerability in the payment method rename endpoint

Medium 5.4

In plain English

A medium-severity cross-site scripting in Wallos from ellite. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 90.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
ellite	Wallos	< 4.7.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/ellite/Wallos/security/advisories/GHSA-p6v5-227f-f3fv x_refsource_CONFIRM
https://github.com/ellite/Wallos/commit/e87387f0ebb540cd33e6dfda7181db9db650ecef x_refsource_MISC