CVE-2026-90543

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-12. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

WWBN AVideo at commit c3edcc274c389816d434acadac07ee78eaf330c1 and earlier, with the Live plugin enabled, contains a missing authentication vulnerability in plugin/Live/socketMessageLiveOwner.json.php. The script reads the key and msg parameters from $_REQUEST, resolves the stream owner via LiveTransmition::keyExists, and verifies that the stream owner (not the caller) is an administrator; it performs no User::isLogged() check and enforces no CSRF token. As a result, an unauthenticated remote attacker who knows an administrator's Live stream key can call sendSocketSuccessMessageToUsers_id and deliver arbitrary in-app/socket notification messages to that administrator. The issue was unpatched at the time of publication.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

September 12, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 12, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

WWBN AVideo Missing Authentication via socketMessageLiveOwner.json.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/wwbn-avideo-missing-authentication-via-socketmessageliveowner-json-php
github Patch Available🟡 PoC Available

Missing authentication: `plugin/Live/socketMessageLiveOwner.json.php` sends a socket message to an admin live owner given only the stream key · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-wcg2-x62c-m28x

Vendor Advisories for CVE-2026-90543(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 / 31× 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. 2026-09-21 01:04 UTCEG score recompute
  2. 2026-09-21 01:04 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 00:40 UTCEG score recompute
  5. 2026-09-20 00:39 UTCGHSA enrichment
  6. 2026-09-19 00:16 UTCEG score recompute
  7. 2026-09-19 00:15 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-17 23:52 UTCEG score recompute
  10. 2026-09-17 23:52 UTCGHSA enrichment
  11. 2026-09-17 19:32 UTCEPSS rescore
  12. 2026-09-16 22:21 UTCEG score recompute
  13. 2026-09-16 22:21 UTCGHSA enrichment
  14. 2026-09-16 14:09 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 21:42 UTCEG score recompute
  17. 2026-09-15 21:42 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 21:18 UTCGHSA enrichment
  20. 2026-09-14 19:21 UTCEG score recompute
  21. 2026-09-14 19:21 UTCGHSA enrichment
  22. 2026-09-14 18:40 UTCEG score recompute
  23. 2026-09-14 18:40 UTCGHSA enrichment
  24. 2026-09-14 14:13 UTCEG score recompute
  25. 2026-09-14 14:13 UTCGHSA enrichment
Show 6 more
  1. 2026-09-13 16:48 UTCEPSS rescore
  2. 2026-09-13 13:49 UTCEG score recompute
  3. 2026-09-13 13:49 UTCGHSA enrichment
  4. 2026-09-12 13:25 UTCEG score recompute
  5. 2026-09-12 12:19 UTCEG score recompute
  6. 2026-09-12 12:18 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90543?
CVE-2026-90543 is a medium vulnerability published on September 12, 2026. WWBN AVideo at commit c3edcc274c389816d434acadac07ee78eaf330c1 and earlier, with the Live plugin enabled, contains a missing authentication vulnerability in plugin/Live/socketMessageLiveOwner.json.php. The script reads the key and msg parameters from $REQUEST, resolves the stream owner via…
When was CVE-2026-90543 disclosed?
CVE-2026-90543 was first published in the National Vulnerability Database on September 12, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90543 actively exploited?
CVE-2026-90543 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 71.6% of all scored CVEs.
What is the CVSS score of CVE-2026-90543?
CVE-2026-90543 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-90543?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90543, 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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