Improperly Controlled Modification of Dynamically-Determined Object Attributes in Open WebUI - CVE-2026-45396
Published: May 11, 2026
Vulnerability identifier: #VU130948
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45396
CWE-ID: CWE-915
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to manipulate evaluation data and spoof feedback authorship.
The vulnerability exists due to improperly controlled modification of dynamically-determined object attributes in the POST /api/v1/evaluations/feedback endpoint when processing feedback creation requests. A remote user can submit a specially crafted request with extra fields such as user_id to manipulate evaluation data and spoof feedback authorship.
The issue is caused by FeedbackForm accepting unexpected fields via extra='allow' and by insert_new_feedback() merging form data after server-derived values, allowing request-supplied fields to overwrite user_id, id, and version.
Affected software
Open WebUI
How to mitigate CVE-2026-45396
Install security update from vendor's website.
Open WebUI - update to 0.9.5