Medium severity · published Sep 11, 2026
CVE-2026-90450
Incorrect Authorization in Malcolm
4.3
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
Malcolm · CISA
before v26.06.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90450
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90450
government-resource
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-26-254-01
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