CVE-2026-45318: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline

Q: How do I fix CVE-2026-45318?

open webui: upgrade to 0.9.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-45318 being exploited?

CVE-2026-45318 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-2026-45318 affect?

CVE-2026-45318 affects open webui. Severity is medium (CVSS 5.4). Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, his advisory tracks a regression of the original Excel-preview XSS (CVE-2026-44549). The same root cause — XLSX.utils.sheet_t

Q: How urgent is CVE-2026-45318?

Priority 27/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2026-45318 is a medium-severity flaw (CVSS 5.4) 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 0.9.3, his advisory tracks a regression of the original Excel-preview XSS (CVE-2026-44549). The same root cause — XLSX.utils.sheet_to_html() output rendered via {@html excelHtml} without DOMPurify — was reintroduced sometime after v0.8.0 and is exploitable again This vulnerability is fixed in 0.9.3.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
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: < 0.9.3

Fixed in: 0.9.3

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 0.9.3 (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-2026-45318?

open webui: upgrade to 0.9.3. Exact commands for each OS are on this page.

Is CVE-2026-45318 being exploited?

CVE-2026-45318 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-2026-45318 affect?

CVE-2026-45318 affects open webui. Severity is medium (CVSS 5.4). Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, his advisory tracks a regression of the original Excel-preview XSS (CVE-2026-44549). The same root cause — XLSX.utils.sheet_t

How urgent is CVE-2026-45318?

Priority 27/100. Public exploit reference

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References

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