Read the docs
TI-2026-31726 Aliases CVE-2026-43621GHSA-pw24-wq86-2799

Simple Machines Forum < 2.1.7 Authorization Confusion via Profile::load()

Priority LOW 37CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Simple Machines Forum (SMF) through 2.1.7, fixed in commit 6f0dc61, contains an authorization state-confusion vulnerability in the profile loader that allows authenticated low-privileged users to gain administrator access by supplying multiple values for the user parameter. Attackers can exploit the mismatch between Profile::$member and User::$me->is_owner during sequential profile loading to be treated as the owner of an administrator profile, enabling unauthorized password changes and full account takeover.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00363 30th percentileScored 2026-11-07
Fix Fixed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SimpleMachinesSMFup to 2.1.7—Patch availableCNA
  • SMF VendorSimpleMachines Affected up to 2.1.7 Fixed in — Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:simplemachines:simple_machines_forum:*:*:*:*:*:*:*:*——SimpleMachines
  • cpe:2.3:a:simplemachines:simple_machines_forum:*:*:*:*:*:*:*:* Versions — — ·SimpleMachines

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-43621
  2. 2026-10-03 Alias added: GHSA-pw24-wq86-2799

References

Patch 1

  • TI-2025-41147 A stored cross-site scripting (XSS) vulnerability in Simple Machines Forum v2.1.6 allows… CVSS 3.1MEDIUM 6.1
  • TI-2024-06892 SimpleMachines SMF User Alert Read Status index.php resource injection CVSS 4.0MEDIUM 5.3
  • TI-2024-06891 SimpleMachines SMF Delete User index.php resource injection CVSS 4.0MEDIUM 5.3
  • TI-2025-02251 SimpleMachines SMF ManageNews.php cross site scripting CVSS 4.0MEDIUM 5.1
  • TI-2025-02250 SimpleMachines SMF ManageAttachments.php cross site scripting CVSS 4.0MEDIUM 5.1
  • TI-2011-00980 SSI.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, does not… CVSS 2.0HIGH 10.0
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences