CVE-2026-88866

HIGHPre-NVD 8.78.7—
EchelonGraph scoreHIGH confidence

Score 8.7 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-10. a secondary CVSS source baseline 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: Elevated riskExposed: 0

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

WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the LoginControl plugin that fails to encode the User-Agent header before storing it in login history. Attackers with any valid login account can inject malicious scripts in the User-Agent header that execute in administrator browsers when viewing the Login History page, allowing script execution within the administrator session.

CVSS v3
8.7
EG Score
8.7(high)
EG Risk
55(Track*)
EG Risk 55/100SSVC: 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
Severity87% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 15, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

WWBN AVideo LoginControl Stored XSS via User-Agent Header | Advisories | VulnCheck

https://www.vulncheck.com/advisories/wwbn-avideo-logincontrol-stored-xss-via-user-agent-header
github Patch Available🟡 PoC Available

Stored XSS: LoginControl stores the `User-Agent` header raw and the admin login-history DataTable renders it as HTML · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-wg67-62q3-2m33

Vendor Advisories for CVE-2026-88866(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 26× in last 7d / 62× 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 01:43 UTCEG score recompute
  2. 2026-09-25 01:43 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 13:21 UTCGHSA enrichment
  5. 2026-09-24 00:59 UTCEG score recompute
  6. 2026-09-24 00:59 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 12:38 UTCGHSA enrichment
  9. 2026-09-23 00:17 UTCEG score recompute
  10. 2026-09-23 00:17 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 11:55 UTCGHSA enrichment
  13. 2026-09-21 23:34 UTCEG score recompute
  14. 2026-09-21 23:34 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 11:12 UTCGHSA enrichment
  17. 2026-09-20 22:50 UTCEG score recompute
  18. 2026-09-20 22:50 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 10:29 UTCGHSA enrichment
  21. 2026-09-19 22:07 UTCEG score recompute
  22. 2026-09-19 22:07 UTCGHSA enrichment
  23. 2026-09-19 09:44 UTCGHSA enrichment
  24. 2026-09-18 21:19 UTCEG score recompute
  25. 2026-09-18 21:19 UTCGHSA enrichment
Show 37 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 08:16 UTCGHSA enrichment
  3. 2026-09-17 19:54 UTCEG score recompute
  4. 2026-09-17 19:54 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 06:43 UTCGHSA enrichment
  7. 2026-09-16 18:09 UTCEG score recompute
  8. 2026-09-16 18:09 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 03:56 UTCGHSA enrichment
  12. 2026-09-15 15:34 UTCEG score recompute
  13. 2026-09-15 15:34 UTCGHSA enrichment
  14. 2026-09-15 14:35 UTCEG score recompute
  15. 2026-09-15 14:35 UTCGHSA enrichment
  16. 2026-09-15 06:40 UTCEG score recompute
  17. 2026-09-15 06:40 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 18:17 UTCGHSA enrichment
  20. 2026-09-14 05:56 UTCGHSA enrichment
  21. 2026-09-13 17:34 UTCEG score recompute
  22. 2026-09-13 17:34 UTCGHSA enrichment
  23. 2026-09-13 16:48 UTCEPSS rescore
  24. 2026-09-13 05:12 UTCGHSA enrichment
  25. 2026-09-12 16:51 UTCEG score recompute
  26. 2026-09-12 16:51 UTCGHSA enrichment
  27. 2026-09-12 15:02 UTCEPSS rescore
  28. 2026-09-12 04:29 UTCGHSA enrichment
  29. 2026-09-11 16:07 UTCEG score recompute
  30. 2026-09-11 16:07 UTCGHSA enrichment
  31. 2026-09-11 14:53 UTCEPSS rescore
  32. 2026-09-11 14:53 UTCEPSS rescore
  33. 2026-09-11 03:39 UTCEG score recompute
  34. 2026-09-11 03:39 UTCGHSA enrichment
  35. 2026-09-10 14:20 UTCEG score recompute
  36. 2026-09-10 13:20 UTCEG score recompute
  37. 2026-09-10 13:20 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-88866?
CVE-2026-88866 is a high vulnerability published on September 10, 2026. WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the LoginControl plugin that fails to encode the User-Agent header before storing it in login history. Attackers with any valid login account can inject malicious scripts in…
When was CVE-2026-88866 disclosed?
CVE-2026-88866 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88866 actively exploited?
CVE-2026-88866 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 64.0% of all scored CVEs.
What is the CVSS score of CVE-2026-88866?
CVE-2026-88866 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-88866?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88866, 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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