CVE-2026-19820

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

A vulnerability in the Backblaze Client allows a local user to make the system not bootable by creating a link from Backblaze's folder to Windows OS system files during a backup. Successful exploitation requires an administrator-level system change that results in the absence of specific Windows OS security controls. This vulnerability is due to improper link resolution.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 11, 2026

Advisory Details (2)

Auto-updated Sep 1, 2026
No patch confirmed yet.
generic

Backblaze | Update Backblaze | Download the Latest Version of Backblaze

https://www.backblaze.com/status/update
generic

Backup Client Release Notes (Windows)

https://www.backblaze.com/computer-backup/docs/backup-client-release-notes-windows

Vendor Advisories for CVE-2026-19820(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 24× in last 7d / 85× 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. 2026-09-20 08:36 UTCGHSA enrichment
  2. 2026-09-19 20:53 UTCEG score recompute
  3. 2026-09-19 20:53 UTCGHSA enrichment
  4. 2026-09-19 09:09 UTCGHSA enrichment
  5. 2026-09-18 21:25 UTCEG score recompute
  6. 2026-09-18 21:25 UTCGHSA enrichment
  7. 2026-09-18 19:27 UTCEPSS rescore
  8. 2026-09-18 08:38 UTCGHSA enrichment
  9. 2026-09-17 20:55 UTCEG score recompute
  10. 2026-09-17 20:55 UTCGHSA enrichment
  11. 2026-09-17 09:12 UTCGHSA enrichment
  12. 2026-09-16 21:29 UTCEG score recompute
  13. 2026-09-16 21:29 UTCGHSA enrichment
  14. 2026-09-16 14:07 UTCEPSS rescore
  15. 2026-09-16 09:22 UTCEG score recompute
  16. 2026-09-16 09:22 UTCGHSA enrichment
  17. 2026-09-16 05:14 UTCEPSS rescore
  18. 2026-09-15 21:39 UTCGHSA enrichment
  19. 2026-09-15 09:52 UTCEG score recompute
  20. 2026-09-15 09:52 UTCGHSA enrichment
  21. 2026-09-14 22:08 UTCGHSA enrichment
  22. 2026-09-14 10:21 UTCGHSA enrichment
  23. 2026-09-13 22:38 UTCEG score recompute
  24. 2026-09-13 22:38 UTCGHSA enrichment
  25. 2026-09-13 16:46 UTCEPSS rescore
Show 60 more
  1. 2026-09-13 10:55 UTCGHSA enrichment
  2. 2026-09-12 23:12 UTCEG score recompute
  3. 2026-09-12 23:12 UTCGHSA enrichment
  4. 2026-09-12 15:00 UTCEPSS rescore
  5. 2026-09-12 11:29 UTCGHSA enrichment
  6. 2026-09-11 23:46 UTCEG score recompute
  7. 2026-09-11 23:46 UTCGHSA enrichment
  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-11 12:02 UTCEG score recompute
  10. 2026-09-11 12:02 UTCGHSA enrichment
  11. 2026-09-11 09:36 UTCEPSS rescore
  12. 2026-09-11 00:19 UTCEG score recompute▲ 2.00
  13. 2026-09-11 00:19 UTCGHSA enrichment
  14. 2026-09-11 00:19 UTCNVD updateCVSS v3 → 7.8 · CVSS v4 → 7.8 · severity → HIGH
  15. 2026-09-10 23:48 UTCEG score recompute▼ 2.00
  16. 2026-09-10 23:48 UTCGHSA enrichment
  17. 2026-09-10 23:39 UTCMITRE cvelistV5CVSS v3 → 5.8 · CVSS v4 → 5.8 · severity → MEDIUM
  18. 2026-09-10 11:38 UTCEG score recompute
  19. 2026-09-10 11:38 UTCGHSA enrichment
  20. 2026-09-10 09:34 UTCEPSS rescore
  21. 2026-09-09 23:41 UTCGHSA enrichment
  22. 2026-09-09 11:11 UTCGHSA enrichment
  23. 2026-09-08 23:28 UTCEG score recompute
  24. 2026-09-08 23:28 UTCGHSA enrichment
  25. 2026-09-08 22:00 UTCEPSS rescore
  26. 2026-09-08 02:39 UTCEG score recompute
  27. 2026-09-08 02:38 UTCGHSA enrichment
  28. 2026-09-07 16:01 UTCEPSS rescore
  29. 2026-09-07 14:56 UTCGHSA enrichment
  30. 2026-09-07 03:10 UTCGHSA enrichment
  31. 2026-09-06 15:26 UTCEG score recompute
  32. 2026-09-06 15:26 UTCGHSA enrichment
  33. 2026-09-06 13:47 UTCEPSS rescore
  34. 2026-09-06 03:42 UTCGHSA enrichment
  35. 2026-09-05 15:59 UTCEG score recompute
  36. 2026-09-05 15:59 UTCGHSA enrichment
  37. 2026-09-05 04:16 UTCGHSA enrichment
  38. 2026-09-04 16:32 UTCEG score recompute
  39. 2026-09-04 16:32 UTCGHSA enrichment
  40. 2026-09-04 05:06 UTCEPSS rescore
  41. 2026-09-04 04:43 UTCGHSA enrichment
  42. 2026-09-03 16:56 UTCGHSA enrichment
  43. 2026-09-03 15:15 UTCGHSA enrichment
  44. 2026-09-03 03:30 UTCGHSA enrichment
  45. 2026-09-02 15:46 UTCEG score recompute
  46. 2026-09-02 15:46 UTCGHSA enrichment
  47. 2026-09-02 14:11 UTCEPSS rescore
  48. 2026-09-02 04:03 UTCGHSA enrichment
  49. 2026-09-01 16:19 UTCEG score recompute▲ 2.00
  50. 2026-09-01 16:19 UTCGHSA enrichment
  51. 2026-09-01 16:17 UTCNVD updateCVSS v3 → 7.8 · CVSS v4 → 7.8 · severity → HIGH
  52. 2026-09-01 15:56 UTCEG score recompute▼ 2.00
  53. 2026-09-01 15:56 UTCGHSA enrichment
  54. 2026-09-01 15:42 UTCMITRE cvelistV5CVSS v3 → 5.8 · CVSS v4 → 5.8 · severity → MEDIUM
  55. 2026-09-01 13:53 UTCEPSS rescore
  56. 2026-09-01 13:08 UTCGHSA enrichment
  57. 2026-09-01 01:23 UTCEG score recompute▲ 2.00
  58. 2026-09-01 01:21 UTCNVD updateCVSS v3 → 7.8 · CVSS v4 → 7.8 · severity → HIGH
  59. 2026-09-01 00:40 UTCEG score recompute
  60. 2026-09-01 00:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19820?
CVE-2026-19820 is a high vulnerability published on September 1, 2026. A vulnerability in the Backblaze Client allows a local user to make the system not bootable by creating a link from Backblaze's folder to Windows OS system files during a backup. Successful exploitation requires an administrator-level system change that results in the absence of specific Windows OS…
When was CVE-2026-19820 disclosed?
CVE-2026-19820 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update 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-2026-19820 actively exploited?
CVE-2026-19820 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 73.9% of all scored CVEs.
What is the CVSS score of CVE-2026-19820?
CVE-2026-19820 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-19820?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19820, 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-2026-19820

Explore →

Is Your Infrastructure Affected by CVE-2026-19820?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs