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CVE-2026-73313

XenForo < 2.3.13 MFA Bypass via Passkey TFA Provider

Published: Sep 8, 2026Updated: Sep 14, 2026 Sources: CVE List NVDCWE-863
6.8MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 67.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

XenForo
commercialaka xenforo forum
XenForoOn-prem
Web & CMS Plugins / forum-wiki
and 1 more affected products View all →

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://bombobombone.github.io/posts/cve-2026-73313/
bombobombone.github.io
https://github.com/BomboBombone/CVE-2026-73313
github.com
https://www.vulncheck.com/advisories/xenforo-mfa-bypass-via-passkey-tfa-provider
vulncheck.com
and 2 more references View all →

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