What is CVE-2026-121733?

CVE-2026-121733 is a medium-severity vulnerability in Webkul Bagisto, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.4/10. Published 2026-11-03.

How severe is CVE-2026-121733?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Arbitrary file upload in Webkul Bagisto

CVE-2026-121733

Bagisto before 2.4.5 contains a stored cross-site scripting vulnerability that allows authenticated customers to upload HTML files via the RMA send-message endpoint without type or extension validation. Attackers can upload a .html attachment containing JavaScript served under /storage/rma-conversation/, executing script in the shop's origin when an administrator opens it.

Vulnerability class: Unrestricted File Upload

Published 2026-11-03.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Webkul Bagisto

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

github.com/bagisto/bagisto/commit/204e43c26705b66ef2ddfb2a9eebb25f5e8f6a2c (patch)
github.com/bagisto/bagisto (product)
github.com/bagisto/bagisto/commit/e28db3e8c53a94a99cf153ac338466720acd9004 (patch)
github.com/bagisto/bagisto/blob/v2.4.4/packages/Webkul/Shop/src/Http/Controller… (technical-description)
github.com/bagisto/bagisto/releases/tag/v2.4.5 (release-notes)
www.vulncheck.com/advisories/bagisto-before-2.4.5-stored-xss-via-rma-conversati… (third-party-advisory)

Frequently asked questions

What is CVE-2026-121733?: CVE-2026-121733 is a medium-severity vulnerability in Webkul Bagisto, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.4/10. Published 2026-11-03.
How severe is CVE-2026-121733?: Medium severity. CVSS v3 base score is 5.4 out of 10.