CVE-2026-28198

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-18. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

An authenticated, low-privileged user with access to the NetBackup Flex OS management shell could bypass the cryptographic signature verification step of a privileged support command by supplying a specially formed access credential. Successful exploitation grants the attacker an unrestricted root shell with full control over the Flex appliance host and all hosted containers, completely compromising confidentiality, integrity, and availability.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

SecAdvisory/COH-2026-0001.md at master · cohesity/SecAdvisory · GitHub

https://github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.md
generic

CVCN

https://www.cvcn.gov.it/cvcn/cve/CVE-2026-28198

Vendor Advisories for CVE-2026-28198(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 11× in last 7d / 11× 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. 2026-09-19 18:04 UTCEG score recompute
  2. 2026-09-19 18:04 UTCGHSA enrichment
  3. 2026-09-19 06:48 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCGHSA enrichment
  5. 2026-09-18 15:25 UTCEG score recompute
  6. 2026-09-18 15:25 UTCGHSA enrichment
  7. 2026-09-18 14:34 UTCEG score recompute
  8. 2026-09-18 14:34 UTCGHSA enrichment
  9. 2026-09-18 12:21 UTCEG score recompute
  10. 2026-09-18 11:19 UTCEG score recompute
  11. 2026-09-18 11:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-28198?
CVE-2026-28198 is a high vulnerability published on September 18, 2026. An authenticated, low-privileged user with access to the NetBackup Flex OS management shell could bypass the cryptographic signature verification step of a privileged support command by supplying a specially formed access credential. Successful exploitation grants the attacker an unrestricted root…
When was CVE-2026-28198 disclosed?
CVE-2026-28198 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28198 actively exploited?
CVE-2026-28198 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 90.0% of all scored CVEs.
What is the CVSS score of CVE-2026-28198?
CVE-2026-28198 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-28198?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28198, 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-2026-28198

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