CVE-2026-73310

MEDIUMNVD 5.95.9—
EchelonGraph scoreHIGH confidence

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: 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 an authorization flaw in the OAuth2 token endpoint that allows attackers controlling any allowlisted redirect URI to bypass redirect URI binding by submitting a different allowlisted URI than the one recorded at authorization time. Attackers can exchange an intercepted authorization code using a mismatched redirect URI to steal OAuth2 tokens from intercepted authorization flows.

CVSS v3
5.9
EG Score
5.9(high)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 11, 2026

Advisory Details (1)

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

XenForo < 2.3.13 OAuth2 Authorization Code Token Theft via redirect_uri Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/xenforo-oauth2-authorization-code-token-theft-via-redirect-uri-bypass

Vendor Advisories for CVE-2026-73310(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 18× in last 7d / 53× 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 09:29 UTCEG score recompute
  2. 2026-09-25 09:29 UTCGHSA enrichment
  3. 2026-09-24 11:51 UTCEG score recompute
  4. 2026-09-24 11:51 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 14:12 UTCGHSA enrichment
  7. 2026-09-22 16:35 UTCEG score recompute
  8. 2026-09-22 16:35 UTCGHSA enrichment
  9. 2026-09-21 21:09 UTCEPSS rescore
  10. 2026-09-21 18:52 UTCGHSA enrichment
  11. 2026-09-20 21:15 UTCEG score recompute
  12. 2026-09-20 21:15 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-19 23:38 UTCEG score recompute
  15. 2026-09-19 23:38 UTCGHSA enrichment
  16. 2026-09-19 02:01 UTCEG score recompute
  17. 2026-09-19 02:00 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 04:22 UTCEG score recompute
  20. 2026-09-18 04:22 UTCGHSA enrichment
  21. 2026-09-17 06:45 UTCEG score recompute
  22. 2026-09-17 06:45 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 08:57 UTCEG score recompute
  25. 2026-09-16 08:57 UTCGHSA enrichment
Show 28 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 11:19 UTCEG score recompute
  3. 2026-09-15 11:19 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 13:41 UTCEG score recompute
  6. 2026-09-14 13:41 UTCGHSA enrichment
  7. 2026-09-13 16:02 UTCGHSA enrichment
  8. 2026-09-12 18:25 UTCEG score recompute
  9. 2026-09-12 18:25 UTCGHSA enrichment
  10. 2026-09-12 15:02 UTCEPSS rescore
  11. 2026-09-11 20:47 UTCEG score recompute
  12. 2026-09-11 20:47 UTCGHSA enrichment
  13. 2026-09-11 18:27 UTCEG score recompute
  14. 2026-09-11 18:27 UTCGHSA enrichment
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 20:49 UTCEG score recompute
  17. 2026-09-10 20:49 UTCGHSA enrichment
  18. 2026-09-10 09:35 UTCEPSS rescore
  19. 2026-09-09 23:12 UTCEG score recompute
  20. 2026-09-09 23:12 UTCGHSA enrichment
  21. 2026-09-09 01:18 UTCEG score recompute
  22. 2026-09-09 01:18 UTCGHSA enrichment
  23. 2026-09-08 20:12 UTCEG score recompute
  24. 2026-09-08 20:12 UTCGHSA enrichment
  25. 2026-09-08 14:30 UTCEG score recompute
  26. 2026-09-08 13:53 UTCEG score recompute
  27. 2026-09-08 13:26 UTCEG score recompute
  28. 2026-09-08 13:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73310?
CVE-2026-73310 is a medium vulnerability published on September 8, 2026. XenForo before 2.3.13 contains an authorization flaw in the OAuth2 token endpoint that allows attackers controlling any allowlisted redirect URI to bypass redirect URI binding by submitting a different allowlisted URI than the one recorded at authorization time. Attackers can exchange an…
When was CVE-2026-73310 disclosed?
CVE-2026-73310 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73310 actively exploited?
CVE-2026-73310 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.9% of all scored CVEs.
What is the CVSS score of CVE-2026-73310?
CVE-2026-73310 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-73310?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73310, 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

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