SecuriTricks - CVE-2026-42276

Description

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

Product(s) Impacted

Vendor	Product	Versions
Onyx	Onyx	<3.0.9, <3.1.6, <3.2.6

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-639

Authorization Bypass Through User-Controlled Key

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	onyx	onyx	<3.0.9	/	/	/	/	/	/	/
a	onyx	onyx	<3.1.6	/	/	/	/	/	/	/
a	onyx	onyx	<3.2.6	/	/	/	/	/	/	/

References

https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w

CVSS Score

4.3 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

View Vector String

Timeline

Published: May 8, 2026, 5:16 a.m.
Last Modified: May 8, 2026, 4:02 p.m.

Status : Undergoing Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-42276