Back to overview

CVE-2026-39903

HIGH
7.1
CVSS 3.1
Description
Simple Machines Forum 2.1 prior to 2.1.8 and 3.0 prior to 3.0 Alpha 5 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.

Metadata

CVE ID
CVE-2026-39903
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-04-07 20:57 UTC
Published
2026-07-10 16:03 UTC
Last updated
2026-07-10 16:03 UTC
Primary CWE
CWE-863
Incorrect Authorization
Vendor / Product
SimpleMachines / SMF
Sources
cve.org  ·  NVD

Severity & Metrics

7.1 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Affected products (1)
VendorProductPlatformVersions
SimpleMachines SMF — 2.1.0 < 2.1.8, 3.0.0 < 3.0.0 Alpha 5
Weakness (CWE)
CWESourceDescription
CWE-863 cna Incorrect Authorization
CVSS scores (2)
ScoreSeverityVersionSourceVector
7.1 HIGH 4.0 cna 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 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
References (5)
Back to overview