CVE-2026-90454

Missing authorization in Malcolm

Published Sep 11, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
A deployment mode intended to expose only read access to a bundled packet-analysis component's interface denies a list of write-capable routes by pattern, but the pattern omits routes that modify tags attached to stored session records, and the proxy configuration otherwise permits the request method those routes use. This allows an authenticated user on a deployment intended to be read-only to add or remove tags on stored session records.

Remediation

Vendor Solution

The latest version of Malcolm (September 2026 or later) fixes these vulnerabilities. Affected users are encouraged to update their instance of Malcolm to the latest version.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Missing authorization in Malcolm
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

Type Values Removed Values Added
Title Authenticated Users Can Modify Session Tags in Read‑Only Deployment of Malcolm
Type Values Removed Values Added
Title Authenticated Users Can Modify Session Tags in Read‑Only Deployment of Malcolm
Type Values Removed Values Added
Title Tag Modification Allowed in Read‑Only Deployment Mode
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Tag Modification Allowed in Read‑Only Deployment Mode
Type Values Removed Values Added
Title Read‑Only Mode Tag Modification Vulnerability in Malcolm
Type Values Removed Values Added
First Time appeared Cisagov
Cisagov malcolm
Vendors & Products Cisagov
Cisagov malcolm
Type Values Removed Values Added
Title Read‑Only Mode Tag Modification Vulnerability in Malcolm
Type Values Removed Values Added
Title Tag Modification Allowed in Read-Only Malcolm Deployment
Type Values Removed Values Added
Title Tag Modification Allowed in Read-Only Malcolm Deployment
Type Values Removed Values Added
Title Read‑Only Deployment Allows Tag Modification
Type Values Removed Values Added
Title Read‑Only Deployment Allows Tag Modification
Type Values Removed Values Added
Description A deployment mode intended to expose only read access to a bundled packet-analysis component's interface denies a list of write-capable routes by pattern, but the pattern omits routes that modify tags attached to stored session records, and the proxy configuration otherwise permits the request method those routes use. This allows an authenticated user on a deployment intended to be read-only to add or remove tags on stored session records.
Weaknesses CWE-862
References
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Oct 2, 2026, 8:54 PM
Reserved
Sep 11, 2026, 9:00 PM
Status
Awaiting Analysis
Published
Sep 11, 2026, 10:16 PM
Modified
Oct 2, 2026, 9:16 PM