Improper Validation of Specified Type of Input in Open WebUI - CVE-2026-87012
Published: September 28, 2026
Vulnerability identifier: #VU152699
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-87012
CWE-ID: CWE-1287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service for calendar alerts.
The vulnerability exists due to improper validation of specified type of input in the upcoming-event lookup in the calendar event model when processing alert offsets from calendar event metadata. A remote user can create an upcoming calendar event with a non-numeric alert value to cause a denial of service for calendar alerts.
The event must fall within the scheduler's one-hour lookahead window.
Affected software
Open WebUI
How to mitigate CVE-2026-87012
Install security update from vendor's website.
Open WebUI - update to 0.11.1