Auth bypass in Feast Feature Server
CVE-2026-23537
A vulnerability has been identified in the Feast Feature Server’s `/save-document` endpoint that allows an unauthenticated remote attacker to write arbitrary JSON files to the server's filesystem. Although the system attempts to restrict file locations, these protections can be bypassed, enabling an attacker to overwrite vital application configurations or startup scripts. Because this flaw requires no credentials or special privileges, any attacker with network access to the server can potentially compromise the integrity of the system. This could lead to unauthorized system modifications, denial of service through disk exhaustion, or potential remote code execution.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (63.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Feast Feature Server — versions 0
- Red Hat Openshift Ai (Rhoai)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-23537?
- CVE-2026-23537 is a critical-severity vulnerability in Feast Feature Server, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-07-01.
- How severe is CVE-2026-23537?
- Critical severity. CVSS v3 base score is 9.1 out of 10.