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CVE-2026-70489— Open WebUI: Instance-wide stall via automation recurrence rules that force multi-second parsing

CVSS 6.5 · Medium EPSS 0.29% · P22

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
open-webuiopen-webui>= 0.9.0, < 0.11.0affected
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I. Basic Information for CVE-2026-70489

Vulnerability Information
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Vulnerability Title
Open WebUI: Instance-wide stall via automation recurrence rules that force multi-second parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, automation recurrence parsing in backend/open_webui/utils/automations.py anchored minutely and hourly rules at a fixed date of 2000-01-01 and then walked forward one interval at a time to find the next run. A single FREQ=MINUTELY rule enumerates roughly a quarter-century of occurrences synchronously on the event loop that also serves scheduler, HTTP, and WebSocket traffic, and the scheduler recomputes the next run for every claimed row on each poll. This causes availability impact for every other user of the instance. This issue is fixed in 0.11.0.
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
Vulnerability Title
Open WebUI 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.9.0版本至0.11.0之前版本存在资源管理错误漏洞，该漏洞源于自动化重复解析时以固定日期为基准逐间隔枚举计算，可能导致实例其他用户遭遇拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
open-webuiopen-webui >= 0.9.0, < 0.11.0 -

II. Public POCs for CVE-2026-70489

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III. Intelligence Information for CVE-2026-70489

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Vendor Advisories for CVE-2026-70489 (1)

Vendor Pages for CVE-2026-70489 (1)

Same Patch Batch · open-webui · 2026-08-04 · 17 CVEs total

CVE-2026-704928.7 HIGHOpen WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages
CVE-2026-704868.2 HIGHOpen WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcodin
CVE-2026-704828.1 HIGHOpen WebUI: Account takeover via OAuth token exchange accepting tokens issued to any clien
CVE-2026-704948.1 HIGHOpen WebUI: A folder write-collaborator can permanently delete the owner's chats by deleti
CVE-2026-704797.7 HIGHOpen WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playw
CVE-2026-704857.1 HIGHOpen WebUI: Any authenticated user can reach internal services and cloud metadata via NAT6
CVE-2026-704916.5 MEDIUMOpen WebUI: Tool source code disclosed to read-only users via the tool list and get endpoi
CVE-2026-704936.5 MEDIUMOpen WebUI: Any authenticated user can stall a worker via a knowledge-search pattern that
CVE-2026-540206.3 MEDIUMOpen WebUI: DNS Rebinding SSRF Bypass
CVE-2026-704906.3 MEDIUMOpen WebUI: Unapproved accounts can open terminal sessions via a WebSocket auth path missi
CVE-2026-704815.4 MEDIUMOpen WebUI: Any member with write access to a standard channel can edit or delete other me
CVE-2026-704875.3 MEDIUMOpen WebUI: Cross-user file content disclosure via request-scoped direct model knowledge m
CVE-2026-704844.3 MEDIUMOpen WebUI: Users denied the image-generation permission can still generate images via cha
CVE-2026-704884.3 MEDIUMOpen WebUI: Deletion of directories and file embeddings in other knowledge bases via sync
CVE-2026-704804.1 MEDIUMOpen WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite
CVE-2026-704833.1 LOWOpen WebUI: Any authenticated user can cancel another user's chat generation via the chat

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-70489

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