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.

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 JavaSc…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.2th percentile) — read the EPSS interpretation.

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.

Affected products

Ellite Wallos — versions < 4.7.0
Wallosapp Wallos

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

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.