CVE-2026-42277: medium-severity vulnerability in onyx-dot-app onyx
Onyx: IDOR in /chat/file/{file_id} allows any authenticated user to download other users files
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.2%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected products
onyx-dot-app · onyxRelated CVEs — onyx-dot-app onyx
In the same product, most dangerous first.
CVE-2026-63178MEDIUMOnyx Curator-scope IDOR: any curator can modify membership of arbitrary user groups via unscoped PATCH /manage/admin/user-group/{id} and /add-users leading to cross-group document disclosureEPSS 0.5%CVE-2026-85700HIGHOnyx 4.6.6 Custom Tool Secret Header Disclosure via Tool EndpointsEPSS 0.5%CVE-2026-71424CRITICALOnyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP serversEPSS 0.5%CVE-2026-42276MEDIUMOnyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessionsEPSS 0.3%