CVE-2026-90443

Cross-site Scripting in Malcolm

Published Sep 11, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
A web interface reflects a portion of the request URL into a script context and a hyperlink attribute without adequate encoding, and does not require authentication to reach. This allows an unauthenticated network attacker to craft a link that, when visited by a user, executes arbitrary script in the context of the affected application and can redirect the user's browser to an arbitrary external site. Successful exploitation could allow an attacker to act with the compromised user's session privileges within the application.

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 Cross‑Site Scripting via Unauthenticated URL Reflection in Malcolm Cross-site Scripting in Malcolm
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}

Type Values Removed Values Added
Title Cross‑Site Scripting via Unauthenticated URL Reflection in Malcolm
Type Values Removed Values Added
Title Unauthenticated Cross‑Site Scripting in Malcolm Web Interface Allows Session‑Based Actions
Type Values Removed Values Added
Title Unauthenticated Cross‑Site Scripting in Malcolm Web Interface Allows Session‑Based Actions
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 Reflected XSS in Malcolm Web Interface Allows Unauthenticated Script Execution
Type Values Removed Values Added
First Time appeared Cisagov
Cisagov malcolm
Vendors & Products Cisagov
Cisagov malcolm
Type Values Removed Values Added
Title Reflected XSS in Malcolm Web Interface Allows Unauthenticated Script Execution
Type Values Removed Values Added
Title Reflected XSS in Malcolm Web Interface Enables Attacker-Driven Session Abuse
Type Values Removed Values Added
Title Reflected XSS in Malcolm Web Interface Enables Attacker-Driven Session Abuse
Type Values Removed Values Added
Title Unauthenticated XSS Vulnerability Enabling Session‑Based Attacks in Malcolm
Type Values Removed Values Added
Title Unauthenticated XSS Vulnerability Enabling Session‑Based Attacks in Malcolm
Type Values Removed Values Added
Description A web interface reflects a portion of the request URL into a script context and a hyperlink attribute without adequate encoding, and does not require authentication to reach. This allows an unauthenticated network attacker to craft a link that, when visited by a user, executes arbitrary script in the context of the affected application and can redirect the user's browser to an arbitrary external site. Successful exploitation could allow an attacker to act with the compromised user's session privileges within the application.
Weaknesses CWE-79
References
Metrics cvssV4_0

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Oct 2, 2026, 9:20 PM
Reserved
Sep 11, 2026, 9:00 PM
Status
Awaiting Analysis
Published
Sep 11, 2026, 10:16 PM
Modified
Oct 2, 2026, 10:16 PM