Vulnerability · Published May 8, 2026 · Assigned by GitHub_M

CVE-2026-42277Onyx: IDOR in /chat/file/{file_id} allows any authenticated user to download other users files

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in onyx from onyx-dot-app. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 90.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 verifies the caller is authenticated but never checks that the file belongs to them. An attacker who knows or obtains a file UUID can access confidential documents, chat attachments, and other files uploaded by any user in the system. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

Affected products (as reported)

Vendor	Product	Versions
onyx-dot-app	onyx	< 3.0.9>= 3.1.0, < 3.1.6>= 3.2.0, < 3.2.6

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-vg3h-35f7-7w6r x_refsource_CONFIRM