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CVE-2026-109299— Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI 0.9.0 至 0.11.4 版本（不含 0.11.4）存在拒绝服务漏洞。具有自动化权限的已认证用户可通过提交无法实现的循环规则，使系统实例陷入停滞。攻击者可反复向自动化创建或更新接口发送诸如“2月30日”之类的无效规则，每次请求将阻塞共享事件循环数秒。

CVSS 6.5 · Medium EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
open-webui open-webui 0.9.0< 0.11.4 affected
0.11.4 unaffected
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I. Basic Information for CVE-2026-109299

Vulnerability Information
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Vulnerability Title
Open WebUI 0.9.0 before 0.11.4 Denial of Service via Recurrence Rule Validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui 0.9.0 ~ 0.11.4 -

II. Public POCs for CVE-2026-109299

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III. Intelligence Information for CVE-2026-109299

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Vendor Advisories for CVE-2026-109299 (2)

Same Patch Batch · open-webui · 2026-10-12 · 19 CVEs total

CVE-2026-109286 8.1 HIGH Open WebUI 0.7.0 before 0.11.4 Session Token Theft via SyncStatsModal
CVE-2026-109572 7.6 HIGH Open WebUI 0.8.6 before 0.11.4 Privilege Escalation via Terminal Proxy
CVE-2026-109291 7.3 HIGH Open WebUI 0.6.33 before 0.11.4 Stored XSS via Citation embed_url
CVE-2026-109290 7.3 HIGH Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview
CVE-2026-109292 6.8 MEDIUM Open WebUI 0.6.27 before 0.11.4 Session Token Disclosure via OAuth-Mode Connections
CVE-2026-109297 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules
CVE-2026-109298 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Memory Exhaustion via Knowledge Search Regex
CVE-2026-109294 6.5 MEDIUM Open WebUI 0.6.42 before 0.11.4 Memory Exhaustion via Compressed Remote Image
CVE-2026-109293 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 Tool Source Disclosure via Tool Export Endpoint
CVE-2026-109295 6.5 MEDIUM Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
CVE-2026-109288 6.4 MEDIUM Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
CVE-2026-109289 6.3 MEDIUM Open WebUI 0.8.8 before 0.11.4 Improper Session Revocation via Terminal WebSocket
CVE-2026-109283 5.4 MEDIUM Open WebUI 0.11.1 before 0.11.4 Authorization Bypass via OAuth Token Exchange
CVE-2026-109285 5.0 MEDIUM Open WebUI 0.6.0 before 0.11.4 Improper Access Control via Stale File Metadata
CVE-2026-109300 4.6 MEDIUM Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds
CVE-2026-109287 4.3 MEDIUM Open WebUI 0.9.6 before 0.11.4 Information Disclosure via Unscoped Directory ID
CVE-2026-109296 4.3 MEDIUM Open WebUI before 0.11.4 Missing Authorization via Backend Index on Model Routes
CVE-2026-109284 4.3 MEDIUM Open WebUI 0.11.0 before 0.11.4 Improper Authorization via Chat Fork Endpoint

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-400

V. Comments for CVE-2026-109299

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