CVE-2026-90450

Incorrect Authorization in Malcolm

MEDIUM
4.3
CVSS Score
Published: September 11, 2026 at 09:50 PM UTC
Updated: October 2, 2026 at 10:16 PM UTC
2 products affected across 2 vendorsMalcolmMalcolm

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
v < v26.06.0
Vendor states this is fixed in v26.06.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMicscert
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-863

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