CVE-2026-21451 Bagisto has HTML Filter Bypass that Enables Stored XSS
Attackers can bypass HTML filters in the CMS editor to inject malicious scripts, leading to administrator account takeover and backend hijacking.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-21451?
CVE-2026-21451 is a medium-severity cross-site scripting vulnerability in bagisto, published on 2 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Bagisto is an open source laravel eCommerce platform. A stored Cross-Site Scripting (XSS) vulnerability exists in Bagisto prior to version 2.3.10 within the CMS page editor. Although the platform normally attempts to sanitize `<script>` tags, the filtering can be bypassed by manipulating the raw HTTP POST request before submission. As a result, arbitrary JavaScript can be stored in the CMS content and executed whenever the page is viewed or edited. This exposes administrators to a high-severity risk, including complete account takeover, backend hijacking, and malicious script execution. Version 2.3.10 fixes the issue.
Weakness: CWE-79
Which versions are affected by CVE-2026-21451?
2 open source packages ship an affected version, including bagisto/bagisto. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
bagisto/bagisto Packagist | All versions | 2.3.10 |
bagisto/bagisto Packagist | All versions | 2.3.10 |
Products include Webkul Bagisto.
How do I fix CVE-2026-21451?
Upgrade bagisto/bagisto to 2.3.10 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-21451 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-21451 exists.
Other vulnerabilities in bagisto
- CVE-2026-21448 Bagisto has Normal & Blind SSTI from low-privilege user when ordering product
- CVE-2026-21446 Bagisto Missing Authentication on Installer API Endpoints
- CVE-2023-36237 Bagisto Cross-Site Request Forgery vulnerability
- CVE-2023-33570 Code injection in n/a
- CVE-2019-16403 Authorization Bypass Through User-Controlled Key in Bagisto
Sources
Also known as GHSA-2mwc-h2mg-v6p8.