CVE-2026-86189

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-05. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

WWBN AVideo contains a path traversal vulnerability in notify.ffmpeg.json.php that allows unauthenticated attackers to write files to arbitrary locations by supplying a caller-chosen path in the avideoRelativePath parameter. Attackers can replay any previously issued ciphertext as a notifyCode token, which is decrypted but never validated, to bypass authentication and write files to the application root and subdirectories.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

WWBN AVideo Unauthenticated Path Traversal via notify.ffmpeg.json.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/wwbn-avideo-unauthenticated-path-traversal-via-notify-ffmpeg-json-php
github Patch Available🟡 PoC Available

Broken Access Control and Path Traversal: notify.ffmpeg.json.php writes a downloaded file to a caller-chosen path, behind a token that is decrypted but never inspected, so any ciphertext the site has issued authenticates the request · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-cprx-fggj-7vpq

Vendor Advisories for CVE-2026-86189(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 61× in last 7d / 123× 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.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-09-19 19:56 UTCGHSA enrichment
  2. 2026-09-19 16:19 UTCEG score recompute
  3. 2026-09-19 16:19 UTCGHSA enrichment
  4. 2026-09-19 12:41 UTCGHSA enrichment
  5. 2026-09-19 09:01 UTCGHSA enrichment
  6. 2026-09-19 05:24 UTCGHSA enrichment
  7. 2026-09-19 01:47 UTCGHSA enrichment
  8. 2026-09-18 22:10 UTCEG score recompute
  9. 2026-09-18 22:10 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:33 UTCEG score recompute
  12. 2026-09-18 18:33 UTCGHSA enrichment
  13. 2026-09-18 17:30 UTCEG score recompute
  14. 2026-09-18 17:30 UTCGHSA enrichment
  15. 2026-09-18 14:27 UTCGHSA enrichment
  16. 2026-09-18 10:50 UTCGHSA enrichment
  17. 2026-09-18 07:13 UTCGHSA enrichment
  18. 2026-09-18 03:36 UTCGHSA enrichment
  19. 2026-09-17 23:59 UTCGHSA enrichment
  20. 2026-09-17 20:22 UTCEG score recompute
  21. 2026-09-17 20:22 UTCGHSA enrichment
  22. 2026-09-17 19:32 UTCEPSS rescore
  23. 2026-09-17 14:13 UTCGHSA enrichment
  24. 2026-09-17 10:29 UTCGHSA enrichment
  25. 2026-09-17 06:51 UTCGHSA enrichment
Show 75 more
  1. 2026-09-17 03:14 UTCGHSA enrichment
  2. 2026-09-16 23:37 UTCGHSA enrichment
  3. 2026-09-16 20:00 UTCGHSA enrichment
  4. 2026-09-16 16:17 UTCEG score recompute
  5. 2026-09-16 16:17 UTCGHSA enrichment
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 12:37 UTCGHSA enrichment
  8. 2026-09-16 09:00 UTCEG score recompute
  9. 2026-09-16 09:00 UTCGHSA enrichment
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 05:11 UTCGHSA enrichment
  12. 2026-09-16 01:33 UTCGHSA enrichment
  13. 2026-09-15 21:56 UTCGHSA enrichment
  14. 2026-09-15 18:18 UTCGHSA enrichment
  15. 2026-09-15 14:38 UTCGHSA enrichment
  16. 2026-09-15 10:59 UTCGHSA enrichment
  17. 2026-09-15 06:55 UTCGHSA enrichment
  18. 2026-09-15 03:18 UTCEG score recompute
  19. 2026-09-15 03:18 UTCGHSA enrichment
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-14 23:41 UTCGHSA enrichment
  23. 2026-09-14 20:04 UTCGHSA enrichment
  24. 2026-09-14 16:27 UTCGHSA enrichment
  25. 2026-09-14 12:49 UTCGHSA enrichment
  26. 2026-09-14 09:12 UTCGHSA enrichment
  27. 2026-09-14 05:34 UTCGHSA enrichment
  28. 2026-09-14 01:57 UTCGHSA enrichment
  29. 2026-09-13 22:21 UTCGHSA enrichment
  30. 2026-09-13 18:43 UTCEG score recompute
  31. 2026-09-13 18:43 UTCGHSA enrichment
  32. 2026-09-13 15:06 UTCGHSA enrichment
  33. 2026-09-13 11:29 UTCGHSA enrichment
  34. 2026-09-13 07:51 UTCGHSA enrichment
  35. 2026-09-13 04:15 UTCGHSA enrichment
  36. 2026-09-13 00:37 UTCGHSA enrichment
  37. 2026-09-12 20:57 UTCGHSA enrichment
  38. 2026-09-12 17:20 UTCEG score recompute
  39. 2026-09-12 17:20 UTCGHSA enrichment
  40. 2026-09-12 13:43 UTCGHSA enrichment
  41. 2026-09-12 10:06 UTCGHSA enrichment
  42. 2026-09-12 06:29 UTCGHSA enrichment
  43. 2026-09-12 02:51 UTCGHSA enrichment
  44. 2026-09-11 23:14 UTCGHSA enrichment
  45. 2026-09-11 19:01 UTCGHSA enrichment
  46. 2026-09-11 15:21 UTCEG score recompute
  47. 2026-09-11 15:21 UTCGHSA enrichment
  48. 2026-09-11 14:53 UTCEPSS rescore
  49. 2026-09-11 14:53 UTCEPSS rescore
  50. 2026-09-11 11:44 UTCEG score recompute
  51. 2026-09-11 11:44 UTCGHSA enrichment
  52. 2026-09-11 07:55 UTCGHSA enrichment
  53. 2026-09-11 04:18 UTCGHSA enrichment
  54. 2026-09-11 00:41 UTCGHSA enrichment
  55. 2026-09-10 21:04 UTCGHSA enrichment
  56. 2026-09-10 17:27 UTCGHSA enrichment
  57. 2026-09-10 13:50 UTCGHSA enrichment
  58. 2026-09-10 10:13 UTCEG score recompute
  59. 2026-09-10 10:13 UTCGHSA enrichment
  60. 2026-09-10 06:35 UTCGHSA enrichment
  61. 2026-09-10 02:58 UTCGHSA enrichment
  62. 2026-09-09 23:20 UTCGHSA enrichment
  63. 2026-09-09 18:27 UTCGHSA enrichment
  64. 2026-09-09 14:50 UTCGHSA enrichment
  65. 2026-09-09 11:13 UTCGHSA enrichment
  66. 2026-09-09 07:35 UTCGHSA enrichment
  67. 2026-09-09 03:58 UTCGHSA enrichment
  68. 2026-09-09 00:22 UTCEG score recompute
  69. 2026-09-09 00:22 UTCGHSA enrichment
  70. 2026-09-08 22:01 UTCEPSS rescore
  71. 2026-09-08 20:14 UTCGHSA enrichment
  72. 2026-09-08 16:16 UTCGHSA enrichment
  73. 2026-09-08 12:07 UTCGHSA enrichment
  74. 2026-09-08 08:25 UTCGHSA enrichment
  75. 2026-09-08 04:46 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-86189?
CVE-2026-86189 is a critical vulnerability published on September 5, 2026. WWBN AVideo contains a path traversal vulnerability in notify.ffmpeg.json.php that allows unauthenticated attackers to write files to arbitrary locations by supplying a caller-chosen path in the avideoRelativePath parameter. Attackers can replay any previously issued ciphertext as a notifyCode…
When was CVE-2026-86189 disclosed?
CVE-2026-86189 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86189 actively exploited?
CVE-2026-86189 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 65.3% of all scored CVEs.
What is the CVSS score of CVE-2026-86189?
CVE-2026-86189 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-86189?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86189, 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.

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