CVE-2026-73319

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.1 from GitHub Security Advisory published 2026-09-08. The CNA's CVSS baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this weekElevated
6.1EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.1Exploit: No code on recordExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

XenForo before 2.3.13 contains a cross-site scripting vulnerability in the dynamic redirect handler that allows unauthenticated attackers to execute arbitrary JavaScript in the board origin by crafting a malicious javascript: URI that bypasses host validation. Attackers can embed the board hostname in the URI authority component and use percent-encoded newlines to evade server-side filters, causing authenticated users who perform a Follow action to execute attacker-supplied JavaScript in their browser.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

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 (value × EchelonGraph’s weight)
Severity61% × 45%
The EG Score, 6.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 8, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Sep 8, 2026
Fix referenced — no release confirmed yet.
Web page

XenForo < 2.3.13 XSS via Dynamic Redirect Handler | Advisories | VulnCheck

https://www.vulncheck.com/advisories/xenforo-xss-via-dynamic-redirect-handler

Vendor Advisories for CVE-2026-73319(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 / 75× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-10-12 15:41 UTCEG score recompute
  4. 2026-10-11 19:26 UTCEG score recompute
  5. 2026-10-11 16:52 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  6. 2026-10-11 16:42 UTCEG score recompute
  7. 2026-10-11 14:01 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-10-10 08:56 UTCEG score recompute
  11. 2026-10-10 08:56 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-10-09 06:04 UTCEG score recompute
  14. 2026-10-09 06:04 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  15. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-10-08 04:07 UTCEG score recompute
  17. 2026-10-08 04:07 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-10-07 02:08 UTCEG score recompute
  20. 2026-10-07 02:08 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-10-06 00:00 UTCEG score recompute
  23. 2026-10-06 00:00 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
Show 73 more
  1. 2026-10-04 21:23 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  2. 2026-10-03 19:25 UTCEG score recompute
  3. 2026-10-03 19:25 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  4. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  5. 2026-10-02 17:29 UTCEG score recompute
  6. 2026-10-02 17:28 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  7. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  8. 2026-10-01 15:27 UTCEG score recompute
  9. 2026-10-01 15:26 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  10. 2026-10-01 09:48 UTCEG score recompute
  11. 2026-10-01 09:48 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  12. 2026-09-30 07:51 UTCEG score recompute
  13. 2026-09-30 07:51 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  14. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-09-29 05:53 UTCEG score recompute
  16. 2026-09-29 05:53 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  17. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-09-28 03:56 UTCEG score recompute
  19. 2026-09-28 03:56 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  21. 2026-09-27 02:00 UTCEG score recompute
  22. 2026-09-27 01:59 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-25 23:57 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  25. 2026-09-24 21:52 UTCEG score recompute
  26. 2026-09-24 21:52 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  27. 2026-09-23 19:42 UTCEG score recompute
  28. 2026-09-23 19:42 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  29. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  30. 2026-09-22 17:17 UTCEG score recompute
  31. 2026-09-22 17:17 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  32. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  33. 2026-09-21 15:05 UTCEG score recompute
  34. 2026-09-21 15:05 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  35. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  36. 2026-09-20 12:41 UTCEG score recompute
  37. 2026-09-20 12:41 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  38. 2026-09-19 10:44 UTCEG score recompute
  39. 2026-09-19 10:44 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  40. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  41. 2026-09-18 08:43 UTCEG score recompute
  42. 2026-09-18 08:43 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  43. 2026-09-17 06:45 UTCEG score recompute
  44. 2026-09-17 06:45 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  45. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  46. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  47. 2026-09-16 04:36 UTCEG score recompute
  48. 2026-09-16 04:36 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  49. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  50. 2026-09-15 02:38 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  51. 2026-09-14 00:41 UTCEG score recompute
  52. 2026-09-14 00:41 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  53. 2026-09-12 22:44 UTCEG score recompute
  54. 2026-09-12 22:44 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  55. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  56. 2026-09-11 20:47 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  57. 2026-09-11 16:19 UTCEG score recompute
  58. 2026-09-11 16:19 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  59. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  60. 2026-09-10 14:22 UTCEG score recompute
  61. 2026-09-10 14:22 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  62. 2026-09-10 13:50 UTCEG score recompute
  63. 2026-09-10 13:50 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  64. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  65. 2026-09-10 03:15 UTCEG score recompute
  66. 2026-09-10 03:15 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  67. 2026-09-09 01:18 UTCEG score recompute
  68. 2026-09-09 01:18 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  69. 2026-09-08 20:11 UTCEG score recompute
  70. 2026-09-08 20:11 UTCGHSA enrichmentGHSA-vggm-cwh9-fm3v · GitHub CVSS 6.1
  71. 2026-09-08 14:30 UTCEG score recompute
  72. 2026-09-08 13:25 UTCEG score recomputeFirst assessed: 6.1 MEDIUM
  73. 2026-09-08 13:24 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-73319?
CVE-2026-73319 is a medium-severity vulnerability; its CVE record was published on September 8, 2026. XenForo before 2.3.13 contains a cross-site scripting vulnerability in the dynamic redirect handler that allows unauthenticated attackers to execute arbitrary JavaScript in the board origin by crafting a malicious javascript: URI that bypasses host validation. Attackers can embed the board hostname…
When was CVE-2026-73319 made public?
CVE-2026-73319 was made public on September 7, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 8, 2026. EchelonGraph's copy of the record carries a last-modified date of October 1, 2026; the record at its source may have been updated since.
Is CVE-2026-73319 actively exploited?
CVE-2026-73319 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73319?
CVE-2026-73319 has a CVSS base score of 6.1 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-73319?
A fix for CVE-2026-73319 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-73319 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-73319

Explore →

Is Your Infrastructure Affected by CVE-2026-73319?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.