{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-28198 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-28198 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-28198 is a critical vulnerability in Cohesity NetBackup Flex OS, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-28198 and fix it if it is affected.\n\nWhat it is: CVE-2026-28198 is a critical vulnerability in Cohesity NetBackup Flex OS, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-28198 in the wild and no public exploit code.\n\nAffected product: Cohesity NetBackup Flex OS. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-28198/ (Markdown: https://insights.sbomify.com/CVE-2026-28198/index.md)","id":"CVE-2026-28198","markdown":"https://insights.sbomify.com/CVE-2026-28198/index.md","name":"CVE-2026-28198","record":{"aliases":["GHSA-h4hc-x5f6-wfc4"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["privilege_escalation","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"NetBackup Flex OS","requires_auth":"low_privilege","summary":"Authenticated low-privileged users can bypass signature verification to gain root access on NetBackup Flex OS appliances.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"ENISA","cpe":[],"cvss":{"score":9.4,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"An authenticated, low-privileged user with access to the NetBackup Flex \nOS management shell could bypass the cryptographic signature \nverification step of a privileged support command by supplying a \nspecially formed access credential. Successful exploitation grants the \nattacker an unrestricted root shell with full control over the Flex \nappliance host and all hosted containers, completely compromising \nconfidentiality, integrity, and availability.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell","id":"CVE-2026-28198","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"privilege_escalation","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Sensitive File Disclosure via Relative Path Traversal in NetBackup Flex OS Shell","id":"CVE-2026-28199"},"packages":[],"prev":{"headline":"Privilege Escalation via Argument Injection in NetBackup Flex OS Shell","id":"CVE-2026-28197"},"products":["NetBackup Flex OS"],"published":"2026-09-18","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-18","vendors":["Cohesity"]},"summary":"Authenticated low-privileged users can bypass signature verification to gain root access on NetBackup Flex OS appliances.","url":"https://insights.sbomify.com/CVE-2026-28198/"}