CVE-2026-109288
Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
- State
- Published
- Severity
- 7.2 High
- Published
- Oct 12, 2026
- Updated
- Oct 23, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.4 Medium | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
open-webuiopen-webui |
|
References
- GitHub Security Advisory (GHSA-wf9m-46cp-c6h6)vendor-advisory
- VulnCheck Advisory: Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Linksthird-party-advisory
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