CVE-2026-43621

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Source
https://cve.org/CVERecord?id=CVE-2026-43621
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43621.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-43621
Published
2026-08-26T21:27:52Z
Modified
2026-10-28T02:30:49Z
Severity
  • 8.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Simple Machines Forum < 2.1.7 Authorization Confusion via Profile::load()
Details

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.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-863"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43621.json"
}
References

Affected packages

Git / github.com/simplemachines/smf

Affected ranges

Type
GIT
Repo
https://github.com/simplemachines/smf
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
6f0dc61958aa86a4b436a222f6176812ed5bbb95
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "2.1.7"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "6f0dc61958aa86a4b436a222f6176812ed5bbb95"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

2.*
2.1beta1
v2.*
v2.1-beta.1
v2.1-beta.2
v2.1-beta.3
v2.1-rc.1
v2.1-rc.2
v2.1-rc.3
v2.1-rc.4
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v2.1.4
v3.*
v3.0-alpha.1
v3.0-alpha.2
v3.0-alpha.3
v3.0-alpha.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43621.json"