open-webui Open WebUI up to 0.11.0 Calendar calendar.py alert_minutes logic error

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k1.39+

Summaryinfo

A vulnerability was found in open-webui Open WebUI up to 0.11.0. It has been rated as problematic. The affected element is an unknown function of the file backend/open_webui/models/calendar.py of the component Calendar. The manipulation of the argument alert_minutes leads to logic error. This vulnerability is documented as CVE-2026-87012. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in open-webui Open WebUI up to 0.11.0 and classified as problematic. This issue affects an unknown function of the file backend/open_webui/models/calendar.py of the component Calendar. The manipulation of the argument alert_minutes with an unknown input leads to a logic error vulnerability. Using CWE to declare the problem leads to CWE-840. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-87012 since 09/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.11.1 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.3
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Logic error
CWE: CWE-840
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Open WebUI 0.11.1

Timelineinfo

09/08/2026 CVE reserved
09/09/2026 +1 days Advisory disclosed
09/09/2026 +0 days VulDB entry created
09/09/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-87012 (🔒)
GCVE (CVE): GCVE-0-2026-87012
GCVE (VulDB): GCVE-100-401891

Entryinfo

Created: 09/09/2026 23:12
Changes: 09/09/2026 23:12 (66)
Complete: 🔍
Cache ID: 216::103

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