Medium severity · published Sep 11, 2026
CVE-2026-90443
Cross-site Scripting in Malcolm
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
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
In the news
VulnerabilityHigh
CISA Malcolm
View CSAF
Summary
The following versions of CISA Malcolm are affected:
Malcolm
CVSS
Vendor
Equipment
Vulnerabilities
v3 8.8
CISA
CISA Malcolm
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Server-Side Request Forgery (SSRF), Authentication Bypass by Spoofing, Missing Authorization, Missing Authentication for Critical Function, Incorrect Authorization, Use of Default Credentials, Improper Certificate Validation, URL Redirection to Untrusted Site ('Open Redirect'), Dependency on Vulnerable Third-Party Component, Use of Password Hash With Insufficient Computational Effort
Background
Critical Infrastructure Sectors: Energy, Information Technology, Water and Wastewater
Countries/Areas Deployed: Worldwide
Company Headquarters Location: United States
Vulnerabilities
Expand All +
CVE-2026-90443
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 si...
Oct 1, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90443
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90443
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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