CVE-2026-8879

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

Version 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via chrome.scripting.registerContentScripts() at runtime. This script is NOT declared in manifest.json and bypasses Chrome Web Store static security review. It runs on all URLs and immediately hides all page content, creates a full-page overlay, pauses all videos, and only restores content when the service worker confirms the page passes filtering. If Securly's servers are unreachable, pages remain indefinitely hidden.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
29.5%
KEV
Not listed

Published

June 3, 2026

Last Modified

June 4, 2026

Advisory Details (1)

Auto-updated Jun 7, 2026
No patch confirmed yet. Sources: cert.
cert

VU#595768 - Securly Chrome Extension contains multiple weak encryption and access control vulnerabilities

https://kb.cert.org/vuls/id/595768

Vendor Advisories for CVE-2026-8879(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 15× in last 7d / 109× 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 138 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8879?
CVE-2026-8879 is a high vulnerability published on June 3, 2026. Version 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via chrome.scripting.registerContentScripts() at runtime. This script is NOT declared in manifest.json and bypasses Chrome Web Store static security review. It runs on all URLs and immediately…
When was CVE-2026-8879 disclosed?
CVE-2026-8879 was first published in the National Vulnerability Database on June 3, 2026, with the most recent update on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8879 actively exploited?
CVE-2026-8879 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8879?
CVE-2026-8879 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8879?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8879, 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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