CVE-2026-45303: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline

Q: How do I fix CVE-2026-45303?

open webui: upgrade to 0.6.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-45303 being exploited?

CVE-2026-45303 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-45303 affect?

CVE-2026-45303 affects open webui. Severity is high (CVSS 7.7). 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

Q: How urgent is CVE-2026-45303?

Priority 35/100. High severity; Public exploit reference

Routine

HIGH 7.7UPGRADE

CVE-2026-45303 is a high-severity flaw (CVSS 7.7) affecting open webui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: openwebui

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-15 22:16 UTCPublished CVE record published
2026-06-17 10:51 UTCUpdated Record last modified

openwebui open webui UPGRADE

Affected: < 0.6.5

Fixed in: 0.6.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy open-webui || rpm -q open-webui || open-webui --version

2. UPGRADE to 0.6.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-webui

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-webui

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45303?

open webui: upgrade to 0.6.5. Exact commands for each OS are on this page.

Is CVE-2026-45303 being exploited?

CVE-2026-45303 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45303 affect?

CVE-2026-45303 affects open webui. Severity is high (CVSS 7.7). 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

How urgent is CVE-2026-45303?

Priority 35/100. High severity; Public exploit reference

Related CVEs

CVE-2026-54020 MEDIUM 6.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70487 MEDIUM 5.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70488 MEDIUM 4.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70489 MEDIUM 6.5 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform
CVE-2026-70490 MEDIUM 6.3 UPGRADE Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform

References

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