CVE-2026-109291

Open WebUI from 0.6.33 before 0.11.4 contains a cross-site scripting vulnerability that allows authenticated users to execute script in victims' sessions by storing javascript: URLs in citation embed_url fields. Attackers can share a crafted chat whose citation, when clicked, is passed to window.open, letting them steal localStorage.token and act as the victim.

CVSS 4.0

8.5CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

7.3CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-10-12

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

References

• https://github.com/open-webui/open-webui/security/advisories/GHSA-qpqv-xwg8-cqpj
• https://www.vulncheck.com/advisories/open-webui-0.6.33-before-0.11.4-stored-xss-via-citation-embed-url

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