Secuno
ENNL
Book demo

CVE-2026-45303

Openwebui Open Webui cross-site scripting (XSS)

7.7 HIGHPublic exploitEPSS 0.30%
  1. Published15 May 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.6.5, through the HTML rendering view, scripts can be injected and executed. The frontend provides a function to visualize the HTML content of a current chat. The content is embedded in an iFrame with the allow-scripts allow-forms allow-same-origin sandbox directive. This means that the content is placed in a sandbox but with permission to execute scripts and access the parent’s data (e.g., local storage). As a result, only a few functions are restricted (e.g., displaying an alert box), but in effect, the sandbox attribute is largely nullified. This vulnerability is fixed in 0.6.5.

CVSS 3.1 breakdown

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

Affected products

Openwebui Open Webui< 0.6.5

Remediation

Fixed in
Openwebui Open Webui≥ 0.6.5

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-928838.7
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.1 before…
CVE-2026-938868.3
IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote authenticated attacker to execute…
CVE-2026-1096338.1
Frappe ERPNext before 15.119.1 and 16.x before 16.32.0 contains a stored cross-site…
CVE-2025-714328.1
Frappe ERPNext before 14.92.1 and 15.x before 15.83.0 contains a reflected cross-site…
CVE-2026-1095588.7
EdgeEver 1.6.0 through 1.112.0 contains a stored cross-site scripting vulnerability in…
CVE-2026-1095578.7
EdgeEver through 1.112.0 contains a stored cross-site scripting vulnerability in…

Frequently asked

Is CVE-2026-45303 being actively exploited?

CVE-2026-45303 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.30%.

How severe is CVE-2026-45303?

CVE-2026-45303 has a CVSS 3.1 base score of 7.7, rated high. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2026-45303?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-45303?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.6.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-45303 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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