CVE-2026-73315

HIGHPre-NVD 8.68.6—
EchelonGraph scoreHIGH confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: 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 server-side request forgery vulnerability in the PayPal REST webhook handler that allows unauthenticated attackers to cause the server to make outbound HTTP requests to arbitrary destinations by supplying a crafted certificate URL in webhook headers without scheme, hostname, or allowlist validation. Attackers can submit a crafted POST to the PayPal webhook callback endpoint to reach internal network resources including cloud instance metadata services, potentially disclosing IAM credentials or enabling secondary internal service exploitation.

CVSS v3
8.6
EG Score
8.6(high)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
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 SSRF via PayPal REST Webhook Handler | Advisories | VulnCheck

https://www.vulncheck.com/advisories/xenforo-ssrf-via-paypal-rest-webhook-handler

Vendor Advisories for CVE-2026-73315(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 25× 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. 2026-09-20 21:42 UTCEG score recompute
  2. 2026-09-20 21:42 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 09:46 UTCGHSA enrichment
  5. 2026-09-19 21:50 UTCEG score recompute
  6. 2026-09-19 21:50 UTCGHSA enrichment
  7. 2026-09-19 09:54 UTCGHSA enrichment
  8. 2026-09-18 21:21 UTCEG score recompute
  9. 2026-09-18 21:21 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 09:05 UTCGHSA enrichment
  12. 2026-09-17 21:09 UTCEG score recompute
  13. 2026-09-17 21:09 UTCGHSA enrichment
  14. 2026-09-17 09:13 UTCGHSA enrichment
  15. 2026-09-16 21:17 UTCEG score recompute
  16. 2026-09-16 21:17 UTCGHSA enrichment
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 08:57 UTCEG score recompute
  19. 2026-09-16 08:57 UTCGHSA enrichment
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-15 20:51 UTCGHSA enrichment
  22. 2026-09-15 08:24 UTCEG score recompute
  23. 2026-09-15 08:24 UTCGHSA enrichment
  24. 2026-09-15 03:12 UTCEPSS rescore
  25. 2026-09-14 20:28 UTCGHSA enrichment
Show 28 more
  1. 2026-09-14 08:28 UTCGHSA enrichment
  2. 2026-09-13 20:31 UTCEG score recompute
  3. 2026-09-13 20:31 UTCGHSA enrichment
  4. 2026-09-13 08:35 UTCGHSA enrichment
  5. 2026-09-12 20:39 UTCEG score recompute
  6. 2026-09-12 20:39 UTCGHSA enrichment
  7. 2026-09-12 15:02 UTCEPSS rescore
  8. 2026-09-12 08:43 UTCGHSA enrichment
  9. 2026-09-11 20:47 UTCEG score recompute
  10. 2026-09-11 20:47 UTCGHSA enrichment
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 13:01 UTCEG score recompute
  13. 2026-09-11 13:01 UTCGHSA enrichment
  14. 2026-09-11 01:05 UTCGHSA enrichment
  15. 2026-09-10 13:09 UTCEG score recompute
  16. 2026-09-10 13:09 UTCGHSA enrichment
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-10 01:13 UTCGHSA enrichment
  19. 2026-09-09 13:17 UTCEG score recompute
  20. 2026-09-09 13:16 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 13:25 UTCEG score recompute
  28. 2026-09-08 13:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73315?
CVE-2026-73315 is a high vulnerability published on September 8, 2026. XenForo before 2.3.13 contains a server-side request forgery vulnerability in the PayPal REST webhook handler that allows unauthenticated attackers to cause the server to make outbound HTTP requests to arbitrary destinations by supplying a crafted certificate URL in webhook headers without scheme,…
When was CVE-2026-73315 disclosed?
CVE-2026-73315 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-2026-73315 actively exploited?
CVE-2026-73315 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 80.2% of all scored CVEs.
What is the CVSS score of CVE-2026-73315?
CVE-2026-73315 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-73315?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73315, 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-2026-73315

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