{"id":"CVE-2026-109300","revision":"2911928cc89e428793b610cee82c87a9","records":[{"revision":"2911928cc89e428793b610cee82c87a9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109300","aliases":[],"title":"Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds","description":"Open WebUI from 0.6.31 before 0.11.4 contains a stored cross-site scripting vulnerability in its Markdown renderer, which treats user-authored tool-call details blocks as tool output and mounts their embeds attribute in script-enabled iframes. Authenticated users can post crafted channel messages, chat messages, or citation content that runs JavaScript in viewers' browsers, enabling in-app phishing, or session hijacking where iframeSandboxAllowSameOrigin is enabled.","state":0,"publishedAt":"2026-10-12T16:04:58.2+00:00","modifiedAt":"2026-10-13T18:09:47.634+00:00","affected":[{"ecosystem":"Vendor product","name":"open-webui","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"open-webui\",\n                    \"product\": \"open-webui\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/open-webui\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0.6.31\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"0.11.4\"\n                        },\n                        {\n                            \"version\": \"0.11.4\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":5.1,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","score":4.6,"severity":"MEDIUM"}],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-9wj4-mcm3-ppj6","https://www.vulncheck.com/advisories/open-webui-0.6.31-before-0.11.4-stored-xss-via-tool-call-embeds"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109300","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109300","identifiers":["CVE-2026-109300"]},"retained":false,"historicalAffected":[]}],"coverage":[]}