CVE-2026-87012— Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value
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 是一个可扩展、功能丰富且用户友好的自托管 AI 平台。在版本 0.9.0 至 0.11.1 期间， 在存储日历事件的 值时未进行类型校验，而共享的即将到期事件调度器以数值方式比较该值。拥有日历权限的已认证用户可以存储一个非数字类型的 值，从而触发异常并中断整个实例范围内的提醒遍历流程，导致在事件仍处于预视时间窗口内时，所有用户的提醒被抑制。该问题已在版本 0.11.1 中修复。
Possible ATT&CK Techniques 1 AI
T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-87012
Vulnerability Information
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Vulnerability Title
Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value
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 0.11.1, backend/open_webui/models/calendar.py stored the calendar event meta.alert_minutes value without type validation and the shared upcoming-event scheduler compared that value numerically. An authenticated user with the calendar permission could store a non-numeric alert_minutes value that raised an exception and aborted the instance-wide alert pass, suppressing all users' reminders while the event remained in the lookahead window. This issue is fixed in version 0.11.1.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | >= 0.9.0, < 0.11.1 | - |
|
II. Public POCs for CVE-2026-87012
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-87012 (3)
Same Patch Batch · open-webui · 2026-09-09 · 16 CVEs total
| CVE-2026-87995 | 8.7 HIGH | Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcodin |
| CVE-2026-87016 | 8.1 HIGH | Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on |
| CVE-2026-87996 | 7.7 HIGH | Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader |
| CVE-2026-87011 | 7.5 HIGH | Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in bac |
| CVE-2026-87998 | 7.1 HIGH | Open WebUI: Non-admin users can delete admin-owned external knowledge connections via know |
| CVE-2026-87999 | 7.1 HIGH | Open WebUI: Any authenticated user can reach the Azure platform channel via server-side we |
| CVE-2026-87015 | 6.8 MEDIUM | Open WebUI: A user's session cookies are sent to tool servers configured for bearer authen |
| CVE-2026-87014 | 6.5 MEDIUM | Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' |
| CVE-2026-88000 | 6.5 MEDIUM | Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic ch |
| CVE-2026-88002 | 6.5 MEDIUM | Open WebUI: Any authenticated user can hang the server via a cyclic chat message history |
| CVE-2026-88001 | 5.0 MEDIUM | Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redi |
| CVE-2026-87013 | 4.3 MEDIUM | Open WebUI: Any authenticated user can start a non-terminating request via a folder parent |
| CVE-2026-87017 | 4.3 MEDIUM | Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool o |
| CVE-2026-87994 | 4.3 MEDIUM | Open WebUI: Channel members can overwrite another member's message via the chat completion |
| CVE-2026-87997 | 4.3 MEDIUM | Open WebUI: Any authenticated user can inject chats into another user's folder via chat co |
IV. Related Vulnerabilities
Same product: open-webui
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CVE-2026-88002
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CVE-2026-88001
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CVE-2026-87999
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CVE-2026-87998
Open WebUI: Non-admin users can delete admin-owned external
Same vendor: open-webui
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CVE-2026-88002
Open WebUI: Any authenticated user can hang the server via a -
CVE-2026-88001
Open WebUI: Server-side fetches reach blocked and internal h -
CVE-2026-88000
Open WebUI: Any authenticated user can hang the server via m -
CVE-2026-87999
Open WebUI: Any authenticated user can reach the Azure platf -
CVE-2026-87998
Open WebUI: Non-admin users can delete admin-owned external
V. Comments for CVE-2026-87012
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