Description
Simple Machines Forum (SMF) through 2.1.7, fixed in commit 6f0dc61, contains an authorization state-confusion vulnerability in the profile loader that allows authenticated low-privileged users to gain administrator access by supplying multiple values for the user parameter. Attackers can exploit the mismatch between Profile::$member and User::$me->is_owner during sequential profile loading to be treated as the owner of an administrator profile, enabling unauthorized password changes and full account takeover.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| SimpleMachines | SMF | ≤ 2.1.7 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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KharalDipendra/CVE-2026-43621 ★ 0 · Oct 27, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- Patch Commit patch
- https://www.vulncheck.com/advisories/simple-machines-forum-authorization-confusion-via-profile-load third-party-advisory