| Component | Open WebUI |
| Severity | medium (CVSS 6.4) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N |
| Published (NVD) | 2026-10-12 |
| Last modified | 2026-10-13 |
| Affected versions | < 0.11.4 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | 0.11.4 |
| Weakness | CWE-79 |
| CISA KEV | not listed |
NVD description
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: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.
What to do
- Upgrade Open WebUI to
0.11.4or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-109288
- https://github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6
- https://www.vulncheck.com/advisories/open-webui-before-0.11.4-stored-xss-via-javascript-urls-in-markdown-links
Read more
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