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CVE-2026-39903: SMF 2.1.0 through 2.1.7, 3.0.0
CVE-2026-39903. CVSS 3.1 base score 7.1 (HIGH, Vendor/CNA). EPSS 0.00467 (percentile 0.39552), scored 24-Oct-2026.
Affected technology
SMF · 2.1.0 through 2.1.7, 3.0.0
SimpleMachines
Description’s affected range: prior to commit 7d048f8 and 3.0 prior to commit a7875e8
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · No user interaction required
What an attacker can do
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. Vendor/CNA’s CVSS 4.0 assessment (base score 7.1/10) rates confidentiality impact as none; integrity impact as high; availability impact as low.
- CWE
- CWE-863
- CCR priority
- 28.5 /100 (P4)
- CVSS 3.1
- 7.1 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L · Vendor/CNA
- EPSS
- 0.00467 · percentile 0.40182 · 2026-10-25
- KEV
- no
Provenance
- FIRST EPSS daily exploit-probability · Source record · observed 2026-10-25 19:52:47.952465+00:00 UTC
- NVD CVE API 2.0 · Source record · observed 2026-10-25 19:51:06.643138+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-39903.html