CVE-2026-109299
Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | open-webui |
| Product | open-webui |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
open-webui / open-webui
0.9.0 < 0.11.4
References
github.com: https://github.com/open-webui/open-webui/security/advisories/GHSA-5w58-mwmh-vf2m github.com: https://github.com/open-webui/open-webui/commit/5fb869db221d9599a576e8e2eea9c3314947d25e vulncheck.com: https://www.vulncheck.com/advisories/open-webui-0.9.0-before-0.11.4-denial-of-service-via-recurrence-rule-validation
Credits
🔍 Classic298