What is CVE-2026-90453?

CVE-2026-90453 is a low-severity vulnerability in Cisa Malcolm, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.5/10. Published 2026-09-11.

How severe is CVE-2026-90453?

Low severity. CVSS v3 base score is 3.5 out of 10.

Open Redirect in Cisa Malcolm

CVE-2026-90453

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.

Vulnerability class: Open Redirect

Published 2026-09-11 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (4.3th percentile), scored 2026-10-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.002 · change: -0.002

Affected products

Cisa Malcolm

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26… (vendor-advisory, government-resource)
www.cisa.gov/news-events/ics-advisories/icsa-26-254-01

Frequently asked questions

What is CVE-2026-90453?: CVE-2026-90453 is a low-severity vulnerability in Cisa Malcolm, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.5/10. Published 2026-09-11.
How severe is CVE-2026-90453?: Low severity. CVSS v3 base score is 3.5 out of 10.