Auth bypass in Cisa Malcolm
CVE-2026-90448
A deployment mode intended to expose only read access to stored data proxies a set of application programming interface routes without restricting which request methods are allowed. One such route accepts a request that creates or overwrites a stored record, including an attacker-chosen identifier, using the application's own elevated backend credentials. This allows an authenticated user on a deployment intended to be read-only to forge or overwrite stored records that should not be modifiable in that deployment mode.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.6% 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
Weakness classification (CWE)
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-2026-90448?
- CVE-2026-90448 is a medium-severity vulnerability in Cisa Malcolm, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-11.
- How severe is CVE-2026-90448?
- Medium severity. CVSS v3 base score is 6.5 out of 10.