What is CVE-2026-42277?

CVE-2026-42277 is a medium-severity vulnerability in Onyx, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-05-08.

How severe is CVE-2026-42277?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Onyx

CVE-2026-42277

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifie…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (10.2th percentile) — read the EPSS interpretation.

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:H/I:N/A:N.

Affected products

Onyx
Onyx-dot-app Onyx — versions < 3.0.9, >= 3.1.0, < 3.1.6, >= 3.2.0, < 3.2.6

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42277?: CVE-2026-42277 is a medium-severity vulnerability in Onyx, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-05-08.
How severe is CVE-2026-42277?: Medium severity. CVSS v3 base score is 6.5 out of 10.