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CVE-2026-56400

Openwebui Open Webui remote code execution

8.3 HIGHPublic exploitEPSS 0.52%
  1. Published15 Jul 2026

Description

open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Openwebui Open Webui< 0.3.14

Remediation

Fixed in
Openwebui Open Webui≥ 0.3.14

References

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Frequently asked

Is CVE-2026-56400 being actively exploited?

CVE-2026-56400 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.52%.

How severe is CVE-2026-56400?

CVE-2026-56400 has a CVSS 3.1 base score of 8.3, rated high. EPSS estimates a 0.52% probability of exploitation.

Which products are affected by CVE-2026-56400?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-56400?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.3.14 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-56400 against the real software inventory on every managed device, every day. 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.