CVE-2026-89239

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-11. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 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 reflected cross-site scripting vulnerability in the showAlertMessage() function that inserts the raw Referer header into a JavaScript comment without encoding. Attackers can craft a Referer header containing */ to close the comment and inject arbitrary JavaScript that executes in the site origin for visitors arriving from the attacker-controlled page.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
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

WWBN AVideo Reflected XSS via Referer Header Comment Breakout | Advisories | VulnCheck

https://www.vulncheck.com/advisories/wwbn-avideo-reflected-xss-via-referer-header-comment-breakout
github Patch Available🟡 PoC Available

Reflected XSS: `showAlertMessage()` inserts the raw Referer into a JavaScript `/** */` comment · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-3pp9-g99w-qw3j

Vendor Advisories for CVE-2026-89239(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 20× in last 7d / 48× 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 00:34 UTCEG score recompute
  2. 2026-09-25 00:34 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 02:06 UTCEG score recompute
  5. 2026-09-24 02:05 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 03:37 UTCEG score recompute
  8. 2026-09-23 03:37 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 05:08 UTCEG score recompute
  11. 2026-09-22 05:08 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 06:40 UTCEG score recompute
  14. 2026-09-21 06:40 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 08:12 UTCEG score recompute
  17. 2026-09-20 08:12 UTCGHSA enrichment
  18. 2026-09-19 09:44 UTCEG score recompute
  19. 2026-09-19 09:43 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 10:49 UTCEG score recompute
  22. 2026-09-18 10:49 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-17 12:20 UTCEG score recompute
  25. 2026-09-17 12:20 UTCGHSA enrichment
Show 23 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 13:52 UTCEG score recompute
  3. 2026-09-16 13:52 UTCGHSA enrichment
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 15:14 UTCEG score recompute
  6. 2026-09-15 15:14 UTCGHSA enrichment
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 16:46 UTCGHSA enrichment
  9. 2026-09-13 18:18 UTCEG score recompute
  10. 2026-09-13 18:18 UTCGHSA enrichment
  11. 2026-09-13 16:48 UTCEPSS rescore
  12. 2026-09-12 19:50 UTCEG score recompute
  13. 2026-09-12 19:50 UTCGHSA enrichment
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-11 21:22 UTCEG score recompute
  16. 2026-09-11 21:22 UTCGHSA enrichment
  17. 2026-09-11 20:34 UTCEG score recompute
  18. 2026-09-11 20:34 UTCGHSA enrichment
  19. 2026-09-11 15:29 UTCEG score recompute
  20. 2026-09-11 15:29 UTCGHSA enrichment
  21. 2026-09-11 12:24 UTCEG score recompute
  22. 2026-09-11 11:29 UTCEG score recompute
  23. 2026-09-11 11:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89239?
CVE-2026-89239 is a medium vulnerability published on September 11, 2026. WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a reflected cross-site scripting vulnerability in the showAlertMessage() function that inserts the raw Referer header into a JavaScript comment without encoding. Attackers can craft a Referer header containing */ to close…
When was CVE-2026-89239 disclosed?
CVE-2026-89239 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-2026-89239 actively exploited?
CVE-2026-89239 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 83.9% of all scored CVEs.
What is the CVSS score of CVE-2026-89239?
CVE-2026-89239 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-89239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89239, 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

Explore the affected products and dependency analysis for CVE-2026-89239

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