CVE-2026-109288CWE-79cross-site-scripting

CVE-2026-109288

Medium · published October 12, 2026

CVSS v3.1
6.4
EPSS
0%
Percentile
13.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
7.2 · 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
EPSS
0.00231 · 13.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-12T21:17Z
References (3)
https://github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6 · [email protected]https://www.vulncheck.com/advisories/open-webui-before-0.11.4-stored-xss-via-javascript-urls-in-markdown-links · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
    cvelistv5
  • 12 OCT 16:04Z
    Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
    cvelistv5