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CVE-2026-45338

Openwebui Open Webui server-side request forgery (SSRF)

7.7 HIGHPublic exploitEPSS 0.38%
  1. Published15 May 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, a Server-Side Request Forgery (SSRF) vulnerability exists in _process_picture_url() in backend/open_webui/utils/oauth.py (line ~1338). The function fetches arbitrary URLs from OAuth picture claims without applying validate_url(), allowing an attacker to force the server to make HTTP requests to internal resources and exfiltrate the full response. This vulnerability is fixed in 0.9.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/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-2026-45338 being actively exploited?

CVE-2026-45338 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-2026-45338?

CVE-2026-45338 has a CVSS 3.1 base score of 7.7, rated high. EPSS estimates a 0.38% probability of exploitation.

Which products are affected by CVE-2026-45338?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-45338?

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-2026-45338 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.