CVE-2026-28198 - Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell

CVE-2026-28198 - Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell

https://cvefeed.io/rssfeed/latest.atom / Fri, 09/18/2026 - 16:32
CVE ID :CVE-2026-28198
Published : Sept. 18, 2026, 12:17 p.m. | 51 minutes ago
Description :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.
Severity: 9.4 | CRITICAL
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Kenya Education Network CERT(KENET-CERT) is a Cybersecurity Emergency Response Team and Co-ordination Center operated by the National Research and Education Network of Kenya. KENET-CERT coordination center promotes awareness on cybersecurity incidences as well as coordinates and assists member institutions in responding effectively to cyber security threats and incidences. KENET-CERT works closely with Kenya's National CIRT coordination center (CIRT/CC) as a sector CIRT for the academic institutions. KENET promotes use of ICT in Teaching, Learning and Research in Higher Education Institutions in Kenya. KENET aims to interconnect all the Universities, Tertiary and Research Institutions in Kenya by setting up a cost effective and sustainable private network with high speed access to the global Internet. KENET also facilitates electronic communication among students and faculties in member institutions, share learning and teaching resources by collaboration in Research and Development of Educational content.