CVE-2026-40911

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-14. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 10.0Exploit: NoneExposed: 0

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

WWBN AVideo is an open source video platform. In versions 29.0 and prior, the YPTSocket plugin's WebSocket server relays attacker-supplied JSON message bodies to every connected client without sanitizing the msg or callback fields. On the client side, plugin/YPTSocket/script.js contains two eval() sinks fed directly by those relayed fields (json.msg.autoEvalCodeOnHTML at line 568 and json.callback at line 95). Because tokens are minted for anonymous visitors and never revalidated beyond decryption, an unauthenticated attacker can broadcast arbitrary JavaScript that executes in the origin of every currently-connected user (including administrators), resulting in universal account takeover, session theft, and privileged action execution. Commit c08694bf6264eb4decceb78c711baee2609b4efd contains a fix.

CVSS v3
10.0
EG Score
10.0(medium)
EPSS
46.7%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 27, 2026

Advisory Details (2)

Auto-updated Jul 16, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

AVideo YPTSocket WebSocket Broadcast Relay Leads to Unauthenticated Cross-User JavaScript Execution via Client-Side eval() Sinks · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-gph2-j4c9-vhhr
github_commit

commit c08694bf6264 (WWBN/AVideo)

Fix landed in WWBN/AVideo commit c08694bf6264 — awaiting tagged release

https://github.com/WWBN/AVideo/commit/c08694bf6264eb4decceb78c711baee2609b4efd

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
composerwwbn/avideo—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
wwbn/avideo10.4 ... 29.0 (18 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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 195 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-24 14:05 UTCEPSS rescore
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  14. 2026-06-15 02:47 UTCEG score recompute
  15. 2026-06-15 02:46 UTCGHSA enrichment
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  19. 2026-06-14 17:29 UTCGHSA enrichment
  20. 2026-06-13 23:00 UTCEPSS rescore
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  23. 2026-06-12 06:14 UTCEG score recompute
  24. 2026-06-12 06:14 UTCGHSA enrichment
  25. 2026-06-12 01:59 UTCEG score recompute
  26. 2026-06-12 01:59 UTCGHSA enrichment
  27. 2026-06-11 21:46 UTCEG score recompute
  28. 2026-06-11 21:46 UTCGHSA enrichment
  29. 2026-06-11 17:33 UTCEG score recompute
  30. 2026-06-11 17:33 UTCGHSA enrichment
  31. 2026-06-11 14:00 UTCEPSS rescore
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  33. 2026-06-10 21:21 UTCEG score recompute
  34. 2026-06-10 21:21 UTCGHSA enrichment
  35. 2026-06-10 17:08 UTCEG score recompute
  36. 2026-06-10 17:08 UTCGHSA enrichment
  37. 2026-06-10 13:22 UTCEPSS rescore
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  39. 2026-06-10 12:48 UTCEG score recompute
  40. 2026-06-10 12:48 UTCGHSA enrichment
  41. 2026-06-10 08:35 UTCEG score recompute
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  44. 2026-06-10 04:23 UTCGHSA enrichment
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  46. 2026-06-10 00:06 UTCGHSA enrichment
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  48. 2026-06-09 18:15 UTCGHSA enrichment
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  50. 2026-06-09 14:03 UTCGHSA enrichment
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  57. 2026-06-08 14:17 UTCEPSS rescore
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  60. 2026-06-08 10:18 UTCGHSA enrichment
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  68. 2026-06-07 17:24 UTCGHSA enrichment
  69. 2026-06-07 15:25 UTCEPSS rescore
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  71. 2026-06-07 13:11 UTCEG score recompute
  72. 2026-06-07 13:11 UTCGHSA enrichment
  73. 2026-06-07 08:58 UTCEG score recompute
  74. 2026-06-07 08:58 UTCGHSA enrichment
  75. 2026-06-07 04:45 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-40911?
CVE-2026-40911 is a critical vulnerability published on April 21, 2026. WWBN AVideo is an open source video platform. In versions 29.0 and prior, the YPTSocket plugin's WebSocket server relays attacker-supplied JSON message bodies to every connected client without sanitizing the msg or callback fields. On the client side, plugin/YPTSocket/script.js contains two eval()…
When was CVE-2026-40911 disclosed?
CVE-2026-40911 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40911 actively exploited?
CVE-2026-40911 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 46.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40911?
CVE-2026-40911 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-40911?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40911, 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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