What is CVE-2026-109286?

CVE-2026-109286 is a high-severity vulnerability in Open-Webui, classified under Origin Validation Error. CVSS score: 8.1/10. Published 2026-10-12.

How severe is CVE-2026-109286?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Open-Webui

CVE-2026-109286

Open WebUI from 0.7.0 before 0.11.4 contains a cross-origin message handling vulnerability in SyncStatsModal that allows any website to steal a signed-in user's session token by posting unvalidated verify:chat messages. Attackers can supply a path-traversal chat id redirecting the authenticated stats export request to the auths endpoint, receiving the victim's JWT for full API access.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Open-Webui

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

github.com/open-webui/open-webui/security/advisories/GHSA-vpq8-f445-hcq7 (vendor-advisory)
www.vulncheck.com/advisories/open-webui-0.7.0-before-0.11.4-session-token-theft… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109286?: CVE-2026-109286 is a high-severity vulnerability in Open-Webui, classified under Origin Validation Error. CVSS score: 8.1/10. Published 2026-10-12.
How severe is CVE-2026-109286?: High severity. CVSS v3 base score is 8.1 out of 10.