CVE-2026-39903
7.1
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
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| SimpleMachines | SMF | 2.1.0 <= 2.1.7 | affected |
| SimpleMachines | SMF | 7d048f8d66aab9af51cd6ee110fbad103cf673e8 | unaffected |
| SimpleMachines | SMF | 3.0.0 | affected |
| SimpleMachines | SMF | a7875e876a647572dd4c45da881b875092caac3d | unaffected |
Weaknesses
- CWE-863: Incorrect Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/SimpleMachines/SMF/pull/9182
- https://github.com/SimpleMachines/SMF/pull/9181
- https://github.com/SimpleMachines/SMF/commit/7d048f8d66aab9af51cd6ee110fbad103cf673e8
- https://github.com/SimpleMachines/SMF/commit/a7875e876a647572dd4c45da881b875092caac3d
- https://www.vulncheck.com/advisories/simple-machines-forum-authorization-bypass-via-attachmentapprove-php
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