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CVE-2026-44552

Openwebui Open Webui vulnerability

8.7 HIGHPublic exploitEPSS 0.42%
  1. Published15 May 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the tool_servers and terminal_servers keys in utils/tools.py do use a prefix. When two or more Open WebUI instances share a Redis database (a supported and documented deployment pattern, e.g., for multi-region deployments, blue-green setups, or cluster topologies), the unprefixed keys collide. An admin on Instance A writing to tool_servers overwrites the value read by Instance B — causing Instance B's users to receive Instance A's tool server configuration. This vulnerability is fixed in 0.9.0.

CVSS 3.1 breakdown

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

Affected products

Openwebui Open Webui< 0.9.0

Remediation

Fixed in
Openwebui Open Webui≥ 0.9.0

References

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Frequently asked

Is CVE-2026-44552 being actively exploited?

CVE-2026-44552 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-44552?

CVE-2026-44552 has a CVSS 3.1 base score of 8.7, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-44552?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-44552?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.9.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-44552 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.