What is CVE-2026-54007?

CVE-2026-54007 is a medium-severity vulnerability in Open-Webui, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2026-06-23.

How severe is CVE-2026-54007?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Open-Webui

CVE-2026-54007

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, the chat message listener allows non-same-origin input:prompt and action:submit messages, so an external site can set prompt text and trigger submitPrompt() in an authenticated victim session. I validated this with a cross-origin attacker page that auto-posted messages and caused unauthorized POST /api/v1/chats/new and POST /api/chat/completions requests containing attacker-controlled prompts. This enables cross-site forced actions and model/tool execution under victim privileges without consent. This vulnerability is fixed in 0.9.6.

EPSS: 0.002 (14.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Open-webui — versions < 0.9.6
Openwebui Open_webui

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-54007?: CVE-2026-54007 is a medium-severity vulnerability in Open-Webui, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2026-06-23.
How severe is CVE-2026-54007?: Medium severity. CVSS v3 base score is 6.5 out of 10.