Open WebUI from 0.9.0 before 0.11.4 contains a denial of service vulnerability that allows authenticated users with automations permission to stall the instance by submitting unsatisfiable recurrence rules. Attackers can repeatedly send rules like February 30th to the automations create or update endpoints, blocking the shared event loop for seconds per request.
History

Fri, 23 Oct 2026 22:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-834

Tue, 13 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 12 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Description Open WebUI from 0.9.0 before 0.11.4 contains a denial of service vulnerability that allows authenticated users with automations permission to stall the instance by submitting unsatisfiable recurrence rules. Attackers can repeatedly send rules like February 30th to the automations create or update endpoints, blocking the shared event loop for seconds per request.
Title Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
First Time appeared Openwebui
Openwebui open Webui
Weaknesses CWE-400
CPEs cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*
Vendors & Products Openwebui
Openwebui open Webui
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-12T16:04:57.527Z

Updated: 2026-10-23T21:58:00.118Z

Reserved: 2026-10-12T14:13:39.026Z

Link: CVE-2026-109299

cve-icon Vulnrichment

Updated: 2026-10-13T15:49:06.297Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-12T17:17:23.540

Modified: 2026-10-23T22:16:55.073

Link: CVE-2026-109299

cve-icon Redhat

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