Skip to content
EXYS
Back to the CVEs

CVE-2026-73313

8.1, high

XenForo Incorrect Authorization Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
0.6% higher than 46.4% of scored CVEs
Exploitation
Exploit code published
Published
8 Sept 2026a month ago

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.

Details

Vendor
XenForo
Product
XenForo
Weakness
CWE-863 (opens in a new tab)
Status
Analyzed
Updated
14 Sept 2026
Assigner
disclosure@vulncheck.com

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

References 5

Exploit code 2

Advisories 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other XenForo CVEs

Every XenForo CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-73309 XenForo before 2.3.13 contains an authentication bypass vulnerability in the OAuth2 token endpoint that allows unauthenticated attackers… EPSS 0.7% 9.1, critical

Beyond this page

Is CVE-2026-73313 in your network?

This page tells you how dangerous CVE-2026-73313 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-73313 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.