CVE-2026-73313

MEDIUM 6.8

XenForo < 2.3.13 MFA Bypass via Passkey TFA Provider

CVSS Score

6.8

EPSS Score

0.0%

EPSS Percentile

0th

XenForo before 2.3.13 contains a multi-factor authentication bypass vulnerability in the passkey TFA provider that allows an authenticated attacker to complete login as another user by submitting their own registered passkey credential during the WebAuthn assertion step. The passkey verification path performs a global credential lookup without validating that the matched credential belongs to the user whose login is pending, enabling an attacker who knows a target account's password to sign the challenge with their own passkey and bypass multi-factor authentication on both public forum and ACP login paths.

CWE	CWE-863
Vendor	xenforo
Product	xenforo
Published	Sep 8, 2026
Last Updated	Sep 14, 2026

Stay Ahead of the Next One

Get instant alerts for xenforo xenforo

Be the first to know when new medium vulnerabilities affecting xenforo xenforo are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

XenForo / XenForo

0 < 2.3.13

References

NVD ↗ CVE.org ↗ EPSS Data ↗

xenforo.com: https://xenforo.com/community/threads/security-fixes-released-for-all-xenforo-and-media-gallery-versions-2-2-0-2-3-12.239856/ xenforo.com: https://xenforo.com/community/threads/xenforo-2-3-13-and-add-ons-released-includes-security-fixes.239857/ bombobombone.github.io: https://bombobombone.github.io/posts/cve-2026-73313/ github.com: https://github.com/BomboBombone/CVE-2026-73313 vulncheck.com: https://www.vulncheck.com/advisories/xenforo-mfa-bypass-via-passkey-tfa-provider

Credits

Marco Paciaroni (BomboBombone) VulnCheck