CVE-2026-90453

Open Redirect in Malcolm

State: Published
Severity: 5.1 Medium
Published: Sep 11, 2026
Updated: Oct 2, 2026
Reserved: Sep 11, 2026

Description

A file-upload handler redirects the authenticated client's browser to a URL taken directly from that same request's Referer header, without validating it against the application's own origin. This allows an authenticated attacker to craft a request that causes another user's browser to be redirected to an arbitrary external destination after completing an upload.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N	icscert
3.1	3.5 Low	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N	icscert

Weaknesses

CWE-601 URL redirection to untrusted site ('open redirect')

Affected Products

Product	Versions
MalcolmCISA	before v26.06.0Affected v26.06.0Not affected

References

https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.jsongovernment-resourcevendor-advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-26-254-01

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