{"id":"CVE-2026-109288","title":"Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme","summary":"Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: l…","severity":"medium","cvss":6.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-79"],"published":"2026-10-12","updated":"2026-10-13","sourceUpdated":"2026-10-13T20:39:48.767","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109288","references":[{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/open-webui-before-0.11.4-stored-xss-via-javascript-urls-in-markdown-links","label":"disclosure@vulncheck.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00292,"epssPercentile":0.21692,"ingestedAt":"2026-10-12T18:00:08.189Z","vendor":"open-webui","product":"open-webui","affected":["open-webui < 0.11.4"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-10-13T15:39:15.981425Z"},"slug":"CVE-2026-109288","body":"## Overview\n\nOpen WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":35.2,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":220946,"id":"CVE-2026-109288","ts":1792026935910,"field":"exploit_available","old":"false","new":"true"}]}