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CVE-2026-70486

Openwebui Open Webui cross-site scripting (XSS)

8.2 HIGHPublic exploitEPSS 0.38%
  1. Published4 Aug 2026

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from localStorage, and take over the account, with possible server-side code execution if the victim was an admin or held workspace.functions. This issue is fixed in 0.11.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

Openwebui Open Webui≥ 0.9.0 < 0.11.0

Remediation

Fixed in
Openwebui Open Webui≥ 0.11.0

References

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Frequently asked

Is CVE-2026-70486 being actively exploited?

CVE-2026-70486 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.38%.

How severe is CVE-2026-70486?

CVE-2026-70486 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 0.38% probability of exploitation.

Which products are affected by CVE-2026-70486?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-70486?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.11.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-70486 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.