CVE-2026-70486: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform

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HIGH 8.2UPGRADE

CVE-2026-70486 is a high-severity flaw (CVSS 8.2) affecting open webui. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from lo

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-79, CWE-1021
Published	2026-08-04
Last modified	2026-09-18

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

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-04 20:16 UTCPublished CVE record published
2026-09-18 14:46 UTCUpdated Record last modified

openwebui open webui UPGRADE

Affected: >= 0.9.0 and < 0.11.0

Fixed in: 0.11.0

Safe to downgrade to: a release before 0.9.0

1. Check installed version

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

2. UPGRADE to 0.11.0 (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.

3. If no update is available yet, DOWNGRADE to a release before 0.9.0 (Debian / Ubuntu)

apt-cache madison open-webui sudo apt install open-webui=<VERSION_BEFORE_0.9.0> sudo apt-mark hold open-webui

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list open-webui sudo dnf downgrade open-webui-<VERSION_BEFORE_0.9.0> sudo dnf versionlock add open-webui

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-70486?

open webui: upgrade to 0.11.0. Exact commands for each OS are on this page.

Is CVE-2026-70486 being exploited?

CVE-2026-70486 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-2026-70486 affect?

CVE-2026-70486 affects open webui. Severity is high (CVSS 8.2). Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files serv

How urgent is CVE-2026-70486?

Priority 42/100. 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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