PT-2026-39267 · Unknown · Open-Webui

Published 2026-05-08 · Updated 2026-05-19 · CVE-2026-44550

Positive Technologies (AI Summary)

CVSS v3.1

5.0

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.9.0

Description Open WebUI is a self-hosted artificial intelligence platform. A mass assignment issue exists where the FolderForm uses a configuration that permits arbitrary fields to pass through Pydantic validation. In the insert new folder function, the server-assigned user id is overwritten by user-supplied data from the POST body. This allows an authenticated attacker to specify a different user id when calling the '/api/v1/folders/' endpoint, enabling them to create folders in other users' accounts. This can be used for phishing by planting folders with deceptive names or for spamming a victim's interface. The user id variable is the primary vector for this overwrite.

Recommendations Update to version 0.9.0.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-44550

GHSA-HR43-RJMR-7WMM

Affected Products

Open-Webui

References · 6

• https://github.com/open-webui/open-webui/security/advisories/GHSA-hr43-rjmr-7wmm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-44550 · Security Note
• https://osv.dev/vulnerability/GHSA-hr43-rjmr-7wmm · Vendor Advisory
• https://github.com/open-webui/open-webui · Note
• https://twitter.com/CVEnew/status/2055457527391731828 · Twitter Post
• https://t.me/cveNotify/163968 · Telegram Post