CVE-2026-39903

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Source
https://cve.org/CVERecord?id=CVE-2026-39903
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39903.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39903
Published
2026-07-10T16:03:20Z
Modified
2026-08-12T03:51:27Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
Simple Machines Forum Authorization Bypass via AttachmentApprove.php
Details

Simple Machines Forum 2.1 prior to commit 7d048f8 and 3.0 prior to commit a7875e8 contains an authorization bypass vulnerability in Sources/Actions/AttachmentApprove.php where a single-character operator error causes the permission check to always pass regardless of user permissions. An authenticated low-privileged user can approve, reject, or delete any pending attachments on any board without holding the required approve_posts permission, bypass moderation queues for their own uploads, and enumerate and delete other users' pending attachments.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39903.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "last_affected": "3.0.0"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/simplemachines/smf

Affected ranges

Type
GIT
Repo
https://github.com/simplemachines/smf
Events
Introduced
453cbdbaec8e022bb1a582a145edcc6fc0edac0e
Fixed
7d048f8d66aab9af51cd6ee110fbad103cf673e8
Fixed
a7875e876a647572dd4c45da881b875092caac3d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.1.0"
        },
        {
            "last_affected": "2.1.7"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v2.*
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v2.1.4
v2.1.5
v2.1.6
v2.1.7
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-2026-39903.json"