CVE-2026-26193
Stored XSS in Open WebUI Chat via Unsafe iFrame Embeds
Publication date: 2026-02-19
Last updated on: 2026-02-20
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| openwebui | open_webui | to 0.6.44 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in Open WebUI versions prior to 0.6.44. It allows an attacker to manually modify the chat history to set the 'embeds' property on a response message. The content of this property is loaded into an iFrame with a sandbox that includes 'allow-scripts' and 'allow-same-origin' permissions, ignoring the intended iframe sandbox configuration. This enables a stored cross-site scripting (XSS) attack on the affected chat.
The vulnerability also triggers when the chat is in a shared format, resulting in a shareable link that contains the malicious payload. This link can be distributed to other users on the same instance, potentially compromising their security.
The issue was fixed in version 0.6.44 of Open WebUI.
How can this vulnerability impact me? :
This vulnerability can lead to stored cross-site scripting (XSS) attacks, which may allow an attacker to execute malicious scripts in the context of other users on the same Open WebUI instance.
Because the malicious payload can be embedded in a shareable link, other users who open the link may have their sessions compromised, potentially leading to unauthorized access to sensitive information or actions performed on their behalf.
The CVSS score of 7.3 indicates a high severity, with impacts including high confidentiality and integrity loss, though no impact on availability.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade Open WebUI to version 0.6.44 or later, as this version fixes the issue.