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CVE-2026-73318

MediumPublished

XenForo < 2.3.13 Missing Authorization via force-agreement Controller

Published: Sep 8, 2026
Updated: Sep 14, 2026
Assigning CNA: VulnCheck
Evidence observed: Sep 8, 2026

Primary CVSS

5.1/ 10Medium

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 25.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

XenForo before 2.3.13 contains a missing authorization vulnerability in the force-agreement controller that allows any ACP administrator to access and submit force-agreement forms regardless of their assigned permissions. Attackers can bypass the option permission declared in the navigation configuration to update the global policy last-updated timestamp, forcing all users to re-agree to the privacy policy or terms of service.

Sources

CVE-2026-73318PoC
Proof-of-concept exploit for XenForo CVE-2026-73318, an authorization bypass allowing ACP administrators to trigger site-wide policy re-agreement. Includes reproduction steps and a Python script.

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