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Vulnerabilities CVE-2026-39903

CVE-2026-39903

High
Open
TLP:CLEAR

Simple Machines Forum Authorization Bypass via AttachmentApprove.php

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Description

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.

Details

CVSS Score
7.1
EPSS Score
0.33%

26.1th percentile

CVSS Vector
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
Confidence
90%
Published
Jul 10, 2026
Last Modified
Jul 28, 2026
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