CVE-2026-19986

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory (severity: LOW) published 2026-08-17. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.4Exploit: Elevated riskExposed services: Not assessed

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

A weakness has been identified in Adblock for Youtube Extension up to 7.2.1 on Chrome. The impacted element is the function updateDynamicRules of the file contentscript.js of the component Event Listener. This manipulation of the argument yt-anti-adblock-detected causes improper authorization. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 17, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

chrome_extensions/AdBlock Ltd. Adblock for Youtube 7.2.1 allows persistent disabling of ad blocking through an unauthenticated DOM event at main · xryj920/chrome_extensions · GitHub

https://github.com/xryj920/chrome_extensions/blob/main/AdBlock%20Ltd.%20Adblock%20for%20Youtube%207.2.1%20allows%20persistent%20disabling%20of%20ad%20blocking%20through%20an%20unauthenticated%20DOM%20event

Vendor Advisories for CVE-2026-19986(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 70× 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 131 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 16:43 UTCGHSA enrichment
  3. 2026-10-03 17:51 UTCEG score recompute
  4. 2026-10-03 17:51 UTCGHSA enrichment
  5. 2026-10-02 08:04 UTCEG score recompute
  6. 2026-10-02 08:04 UTCGHSA enrichment
  7. 2026-10-01 19:49 UTCEPSS rescore
  8. 2026-10-01 09:02 UTCEG score recompute
  9. 2026-10-01 09:02 UTCGHSA enrichment
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-30 10:10 UTCEG score recompute
  12. 2026-09-30 10:10 UTCGHSA enrichment
  13. 2026-09-29 15:21 UTCEPSS rescore
  14. 2026-09-29 06:03 UTCEG score recompute
  15. 2026-09-29 06:03 UTCGHSA enrichment
  16. 2026-09-28 13:51 UTCEPSS rescore
  17. 2026-09-28 07:10 UTCEG score recompute
  18. 2026-09-28 07:10 UTCGHSA enrichment
  19. 2026-09-27 13:47 UTCEPSS rescore
  20. 2026-09-27 08:19 UTCEG score recompute
  21. 2026-09-27 08:19 UTCGHSA enrichment
  22. 2026-09-26 15:58 UTCEPSS rescore
  23. 2026-09-25 02:14 UTCEG score recompute
  24. 2026-09-25 02:14 UTCGHSA enrichment
  25. 2026-09-23 20:28 UTCEG score recompute
Show 75 more
  1. 2026-09-23 20:28 UTCGHSA enrichment
  2. 2026-09-22 20:43 UTCEG score recompute
  3. 2026-09-22 20:43 UTCGHSA enrichment
  4. 2026-09-21 18:42 UTCEG score recompute
  5. 2026-09-21 18:42 UTCGHSA enrichment
  6. 2026-09-20 19:41 UTCGHSA enrichment
  7. 2026-09-19 20:49 UTCEG score recompute
  8. 2026-09-19 20:49 UTCGHSA enrichment
  9. 2026-09-18 21:56 UTCEG score recompute
  10. 2026-09-18 21:56 UTCGHSA enrichment
  11. 2026-09-18 19:27 UTCEPSS rescore
  12. 2026-09-17 22:04 UTCEG score recompute
  13. 2026-09-17 22:04 UTCGHSA enrichment
  14. 2026-09-16 23:12 UTCEG score recompute
  15. 2026-09-16 23:12 UTCGHSA enrichment
  16. 2026-09-16 14:07 UTCEPSS rescore
  17. 2026-09-16 05:14 UTCEPSS rescore
  18. 2026-09-15 20:14 UTCEG score recompute
  19. 2026-09-15 20:14 UTCGHSA enrichment
  20. 2026-09-14 21:22 UTCGHSA enrichment
  21. 2026-09-13 22:06 UTCEG score recompute
  22. 2026-09-13 22:06 UTCGHSA enrichment
  23. 2026-09-13 16:46 UTCEPSS rescore
  24. 2026-09-12 23:14 UTCEG score recompute
  25. 2026-09-12 23:14 UTCGHSA enrichment
  26. 2026-09-12 15:00 UTCEPSS rescore
  27. 2026-09-12 00:21 UTCEG score recompute
  28. 2026-09-12 00:21 UTCGHSA enrichment
  29. 2026-09-11 14:52 UTCEPSS rescore
  30. 2026-09-11 09:36 UTCEPSS rescore
  31. 2026-09-11 01:29 UTCEG score recompute
  32. 2026-09-11 01:29 UTCGHSA enrichment
  33. 2026-09-10 09:34 UTCEPSS rescore
  34. 2026-09-10 02:36 UTCGHSA enrichment
  35. 2026-09-09 03:44 UTCEG score recompute
  36. 2026-09-09 03:44 UTCGHSA enrichment
  37. 2026-09-08 22:00 UTCEPSS rescore
  38. 2026-09-07 20:51 UTCEG score recompute
  39. 2026-09-07 20:51 UTCGHSA enrichment
  40. 2026-09-07 16:01 UTCEPSS rescore
  41. 2026-09-06 21:58 UTCEG score recompute
  42. 2026-09-06 21:58 UTCGHSA enrichment
  43. 2026-09-06 13:47 UTCEPSS rescore
  44. 2026-09-05 23:06 UTCEG score recompute
  45. 2026-09-05 23:06 UTCGHSA enrichment
  46. 2026-09-05 00:14 UTCEG score recompute
  47. 2026-09-05 00:14 UTCGHSA enrichment
  48. 2026-09-04 05:06 UTCEPSS rescore
  49. 2026-09-04 00:38 UTCGHSA enrichment
  50. 2026-09-03 00:42 UTCEG score recompute
  51. 2026-09-03 00:42 UTCGHSA enrichment
  52. 2026-09-02 14:11 UTCEPSS rescore
  53. 2026-09-02 01:48 UTCEG score recompute
  54. 2026-09-02 01:48 UTCGHSA enrichment
  55. 2026-09-01 13:53 UTCEPSS rescore
  56. 2026-09-01 04:39 UTCEPSS rescore
  57. 2026-09-01 02:24 UTCGHSA enrichment
  58. 2026-08-31 03:29 UTCEG score recompute
  59. 2026-08-31 03:29 UTCGHSA enrichment
  60. 2026-08-30 19:17 UTCEPSS rescore
  61. 2026-08-30 04:36 UTCEG score recompute
  62. 2026-08-30 04:36 UTCGHSA enrichment
  63. 2026-08-30 01:22 UTCEPSS rescore
  64. 2026-08-29 05:43 UTCEG score recompute
  65. 2026-08-29 05:42 UTCGHSA enrichment
  66. 2026-08-28 21:41 UTCEPSS rescore
  67. 2026-08-28 04:08 UTCEG score recompute
  68. 2026-08-28 04:08 UTCGHSA enrichment
  69. 2026-08-27 14:25 UTCEPSS rescore
  70. 2026-08-27 05:10 UTCEG score recompute
  71. 2026-08-27 05:10 UTCGHSA enrichment
  72. 2026-08-26 14:46 UTCEPSS rescore
  73. 2026-08-26 06:17 UTCEG score recompute
  74. 2026-08-26 06:17 UTCGHSA enrichment
  75. 2026-08-25 13:48 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-19986?
CVE-2026-19986 is a medium vulnerability published on August 17, 2026. A weakness has been identified in Adblock for Youtube Extension up to 7.2.1 on Chrome. The impacted element is the function updateDynamicRules of the file contentscript.js of the component Event Listener. This manipulation of the argument yt-anti-adblock-detected causes improper authorization. It…
When was CVE-2026-19986 disclosed?
CVE-2026-19986 was first published on August 17, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19986 actively exploited?
CVE-2026-19986 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19986?
CVE-2026-19986 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19986?
No fix for CVE-2026-19986 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-19986 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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