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CVE-2026-90450

Incorrect Authorization in Malcolm

CVSS 4.0 5.3 MEDIUMCVSS 3.1 4.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-90450

Published

The application's role-authorization lookup defaults to granting access when a request handler's name is not present in its table of role requirements, rather than defaulting to deny. Any request handler that is not explicitly registered in this table is reachable by any authenticated user regardless of their assigned role, and any newly added handler is fail-open by default until explicitly added to the table.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-90450

Published

Malcolm

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "CISA",
                    "product": "Malcolm",
                    "repo": "https://github.com/cisagov/Malcolm",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "v26.06.0",
                            "versionType": "custom"
                        },
                        {
                            "status": "unaffected",
                            "version": "v26.06.0"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON