CVE-2026-89256

HIGHPre-NVD 8.78.7—
EchelonGraph scoreHIGH confidence

Score 8.7 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-11. 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.

AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the Bookmark plugin where chapter names are not encoded before being concatenated into public watch-page HTML. A video owner can inject malicious scripts via the bookmark name parameter, and every visitor of that video executes the payload in the AVideo origin.

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
28%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 11, 2026

Advisory Details (2)

Auto-updated Sep 11, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

AVideo Bookmark Plugin Stored XSS via Chapter Names | Advisories | VulnCheck

https://www.vulncheck.com/advisories/avideo-bookmark-plugin-stored-xss-via-chapter-names
github Patch Available🟡 PoC Available

Stored XSS: Bookmark chapter names are concatenated into public watch-page HTML · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-jggq-mm5m-r5wv

Vendor Advisories for CVE-2026-89256(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 27× in last 7d / 60× 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 08:46 UTCGHSA enrichment
  2. 2026-09-24 20:22 UTCEG score recompute
  3. 2026-09-24 20:22 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 07:57 UTCGHSA enrichment
  6. 2026-09-23 19:34 UTCEG score recompute
  7. 2026-09-23 19:33 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 06:14 UTCGHSA enrichment
  10. 2026-09-22 17:50 UTCEG score recompute
  11. 2026-09-22 17:50 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 05:26 UTCEG score recompute
  14. 2026-09-22 05:26 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 17:03 UTCGHSA enrichment
  17. 2026-09-21 04:19 UTCEG score recompute
  18. 2026-09-21 04:19 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 15:56 UTCGHSA enrichment
  21. 2026-09-20 03:31 UTCEG score recompute
  22. 2026-09-20 03:31 UTCGHSA enrichment
  23. 2026-09-19 15:08 UTCGHSA enrichment
  24. 2026-09-19 02:41 UTCEG score recompute
  25. 2026-09-19 02:41 UTCGHSA enrichment
Show 35 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 14:17 UTCGHSA enrichment
  3. 2026-09-18 01:53 UTCEG score recompute
  4. 2026-09-18 01:53 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 13:30 UTCGHSA enrichment
  7. 2026-09-17 01:03 UTCEG score recompute
  8. 2026-09-17 01:03 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 12:39 UTCEG score recompute
  11. 2026-09-16 12:39 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 00:15 UTCGHSA enrichment
  14. 2026-09-15 11:52 UTCEG score recompute
  15. 2026-09-15 11:52 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 23:28 UTCGHSA enrichment
  18. 2026-09-14 10:43 UTCGHSA enrichment
  19. 2026-09-13 22:19 UTCEG score recompute
  20. 2026-09-13 22:19 UTCGHSA enrichment
  21. 2026-09-13 16:48 UTCEPSS rescore
  22. 2026-09-13 09:56 UTCGHSA enrichment
  23. 2026-09-12 21:33 UTCEG score recompute
  24. 2026-09-12 21:33 UTCGHSA enrichment
  25. 2026-09-12 15:02 UTCEPSS rescore
  26. 2026-09-12 09:10 UTCGHSA enrichment
  27. 2026-09-11 20:46 UTCEG score recompute
  28. 2026-09-11 20:46 UTCGHSA enrichment
  29. 2026-09-11 19:19 UTCEG score recompute
  30. 2026-09-11 19:19 UTCGHSA enrichment
  31. 2026-09-11 15:28 UTCEG score recompute
  32. 2026-09-11 15:28 UTCGHSA enrichment
  33. 2026-09-11 12:23 UTCEG score recompute
  34. 2026-09-11 11:27 UTCEG score recompute
  35. 2026-09-11 11:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89256?
CVE-2026-89256 is a high vulnerability published on September 11, 2026. AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the Bookmark plugin where chapter names are not encoded before being concatenated into public watch-page HTML. A video owner can inject malicious scripts via the bookmark name…
When was CVE-2026-89256 disclosed?
CVE-2026-89256 was first published in the National Vulnerability Database on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89256 actively exploited?
CVE-2026-89256 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 72.3% of all scored CVEs.
What is the CVSS score of CVE-2026-89256?
CVE-2026-89256 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-89256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89256, 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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