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CVE-2026-56398

Openwebui Open Webui cross-site scripting (XSS)

7.3 HIGHPublic exploitEPSS 0.64%
  1. Published15 Jul 2026

Description

Open WebUI before 0.9.5 contains a stored cross-site scripting vulnerability in the OAuth authentication flow where the picture claim URL MIME type is inferred from file extension rather than Content-Type header, allowing SVG files to bypass the profile image validator and be stored as data URIs. Authenticated users who visit the profile image endpoint receive attacker-controlled SVG content with inline disposition and no default security headers, enabling script execution in the same origin to steal authentication tokens and achieve account takeover.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected products

Openwebui Open Webui< 0.9.5

Remediation

Fixed in
Openwebui Open Webui≥ 0.9.5

References

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Frequently asked

Is CVE-2026-56398 being actively exploited?

CVE-2026-56398 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-56398?

CVE-2026-56398 has a CVSS 3.1 base score of 7.3, rated high. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-56398?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-56398?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.9.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-56398 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.