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.

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Advisories

No advisories yet.

Fixes

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.


Workaround

No workaround given by the vendor.

History

Tue, 15 Sep 2026 20:45:00 +0000

Type Values Removed Values Added
Title Open Redirect via Unvalidated Referer in Malcolm File‑Upload

Tue, 15 Sep 2026 07:00:00 +0000

Type Values Removed Values Added
Title Authenticated Open Redirect via File Upload Referer Header

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Title Authenticated Open Redirect via File Upload Referer Header

Mon, 14 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Mon, 14 Sep 2026 09:45:00 +0000

Type Values Removed Values Added
Title Authenticated Open Redirect via Constructed Referer Header

Mon, 14 Sep 2026 00:45:00 +0000

Type Values Removed Values Added
Title Authenticated Open Redirect via Constructed Referer Header

Sun, 13 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Cisagov
Cisagov malcolm
Vendors & Products Cisagov
Cisagov malcolm

Sun, 13 Sep 2026 08:00:00 +0000

Type Values Removed Values Added
Title Open Redirect via Referer Header after File Upload in Malcolm

Sat, 12 Sep 2026 23:30:00 +0000

Type Values Removed Values Added
Title Open Redirect via Referer Header after File Upload in Malcolm

Sat, 12 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Title Authenticated Open Redirect in Malcolm File‑Upload Handler

Sat, 12 Sep 2026 09:30:00 +0000

Type Values Removed Values Added
Title Authenticated Open Redirect in Malcolm File‑Upload Handler

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-601
References
Metrics cvssV4_0

{'score': 5.1, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2026-09-14T13:00:30.500Z

Reserved: 2026-09-11T21:00:09.301Z

Link: CVE-2026-90453

cve-icon Vulnrichment

Updated: 2026-09-14T12:57:21.701Z

cve-icon NVD

Status : Received

Published: 2026-09-11T22:16:47.630

Modified: 2026-09-14T13:19:29.037

Link: CVE-2026-90453

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T20:30:10Z

Weaknesses