Simple Machines Forum < 2.1.7 Authorization Confusion via Profile::load()
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.
CVE-2026-43621
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-43621
SMF
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/SimpleMachines/SMF",
"vendor": "SimpleMachines",
"product": "SMF",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "semver",
"lessThanOrEqual": "2.1.7"
},
{
"status": "unaffected",
"version": "6f0dc61958aa86a4b436a222f6176812ed5bbb95",
"versionType": "git"
}
],
"packageURL": "pkg:github/SimpleMachines/SMF",
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43621
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #5428 · Revision 1
- Added to Heist Feed
- Publisher date