CVE-2026-73313

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 55% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 14, 2026

Advisory Details (1)

Auto-updated Sep 8, 2026
No patch confirmed yet.
generic

XenForo < 2.3.13 MFA Bypass via Passkey TFA Provider | Advisories | VulnCheck

https://www.vulncheck.com/advisories/xenforo-mfa-bypass-via-passkey-tfa-provider

Vendor Advisories for CVE-2026-73313(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× in last 7d / 67× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 07:00 UTCGHSA enrichment
  2. 2026-09-24 18:31 UTCEG score recompute
  3. 2026-09-24 18:31 UTCGHSA enrichment
  4. 2026-09-24 06:02 UTCEG score recompute
  5. 2026-09-24 06:02 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 17:33 UTCGHSA enrichment
  8. 2026-09-23 05:04 UTCGHSA enrichment
  9. 2026-09-22 16:35 UTCEG score recompute
  10. 2026-09-22 16:35 UTCGHSA enrichment
  11. 2026-09-22 03:55 UTCEG score recompute
  12. 2026-09-22 03:55 UTCGHSA enrichment
  13. 2026-09-21 21:09 UTCEPSS rescore
  14. 2026-09-21 15:26 UTCGHSA enrichment
  15. 2026-09-21 02:55 UTCEG score recompute
  16. 2026-09-21 02:55 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-20 14:26 UTCGHSA enrichment
  19. 2026-09-20 01:52 UTCEG score recompute
  20. 2026-09-20 01:52 UTCGHSA enrichment
  21. 2026-09-19 13:23 UTCGHSA enrichment
  22. 2026-09-19 00:54 UTCEG score recompute
  23. 2026-09-19 00:54 UTCGHSA enrichment
  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 12:24 UTCGHSA enrichment
Show 42 more
  1. 2026-09-17 23:55 UTCEG score recompute
  2. 2026-09-17 23:55 UTCGHSA enrichment
  3. 2026-09-17 10:56 UTCGHSA enrichment
  4. 2026-09-16 22:27 UTCEG score recompute
  5. 2026-09-16 22:27 UTCGHSA enrichment
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 09:54 UTCEG score recompute
  8. 2026-09-16 09:54 UTCGHSA enrichment
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 21:25 UTCGHSA enrichment
  11. 2026-09-15 08:56 UTCEG score recompute
  12. 2026-09-15 08:56 UTCGHSA enrichment
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 20:27 UTCGHSA enrichment
  15. 2026-09-14 19:40 UTCEG score recompute
  16. 2026-09-14 19:40 UTCGHSA enrichment
  17. 2026-09-14 11:12 UTCGHSA enrichment
  18. 2026-09-13 22:43 UTCEG score recompute
  19. 2026-09-13 22:43 UTCGHSA enrichment
  20. 2026-09-13 10:14 UTCGHSA enrichment
  21. 2026-09-12 21:45 UTCEG score recompute
  22. 2026-09-12 21:45 UTCGHSA enrichment
  23. 2026-09-12 15:02 UTCEPSS rescore
  24. 2026-09-12 09:16 UTCGHSA enrichment
  25. 2026-09-11 20:47 UTCEG score recompute▲ 1.30
  26. 2026-09-11 20:47 UTCGHSA enrichment
  27. 2026-09-11 20:35 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  28. 2026-09-11 20:09 UTCEG score recompute
  29. 2026-09-11 20:09 UTCGHSA enrichment
  30. 2026-09-11 14:53 UTCEPSS rescore
  31. 2026-09-10 21:42 UTCEG score recompute
  32. 2026-09-10 21:42 UTCGHSA enrichment
  33. 2026-09-10 09:35 UTCEPSS rescore
  34. 2026-09-09 23:30 UTCEG score recompute
  35. 2026-09-09 23:30 UTCGHSA enrichment
  36. 2026-09-09 01:18 UTCEG score recompute
  37. 2026-09-09 01:18 UTCGHSA enrichment
  38. 2026-09-08 20:12 UTCEG score recompute
  39. 2026-09-08 20:12 UTCGHSA enrichment
  40. 2026-09-08 14:30 UTCEG score recompute
  41. 2026-09-08 13:26 UTCEG score recompute
  42. 2026-09-08 13:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73313?
CVE-2026-73313 is a high vulnerability published on September 8, 2026. 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…
When was CVE-2026-73313 disclosed?
CVE-2026-73313 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73313 actively exploited?
CVE-2026-73313 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.8% of all scored CVEs.
What is the CVSS score of CVE-2026-73313?
CVE-2026-73313 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-73313?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73313, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-73313

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