CVE-2026-39903 (GCVE-0-2026-39903)

Vulnerability from cvelistv5 – Published: 2026-07-10 16:03 – Updated: 2026-07-28 01:48 X_Open Source
VLAI
Title
Simple Machines Forum Authorization Bypass via AttachmentApprove.php
Summary
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.
Severity
7.1 (High)
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
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 01:56 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6925 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
SimpleMachines SMF Affected: 2.1.0 , ≤ 2.1.7 (semver)
Unaffected: 7d048f8d66aab9af51cd6ee110fbad103cf673e8 (git)
Affected: 3.0.0 (semver)
Unaffected: a7875e876a647572dd4c45da881b875092caac3d (git)
    cpe:2.3:a:simplemachines:simple_machines_forum:*:*:*:*:*:*:*:*
    cpe:2.3:a:simplemachines:simple_machines_forum:3.0.0:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-04-07 00:00
Credits
Elure (Marasescu Mihnea-Luca) VulnCheck
Show details on NVD website
To clipboard 

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              "url": "https://www.vulncheck.com/advisories/simple-machines-forum-authorization-bypass-via-attachmentapprove-php"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "tags": [
            "x_open-source"
          ],
          "title": "Simple Machines Forum Authorization Bypass via AttachmentApprove.php",
          "x_generator": {
            "engine": "vulncheck"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-39903",
        "datePublished": "2026-07-10T16:03:20.983Z",
        "dateReserved": "2026-04-07T20:57:06.209Z",
        "dateUpdated": "2026-07-28T01:48:45.607Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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