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CVE-2026-87998: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform

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HIGH 7.1UPGRADE

CVE-2026-87998 is a high-severity flaw (CVSS 7.1) 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 0.10.0 until 0.11.1, DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base but then removed its administrator-owned external connection without a separate administrator check or a check for other dependent knowledge bases. A non-administrator with write access to one external knowledge

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score7.1 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.5% (top 58%)
CISA exploited listNo
WeaknessCWE-269, CWE-863
Published2026-09-09
Last modified2026-09-16
Publisher (CNA): GitHub, Inc. · Vendor: openwebui

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Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openwebui open webui UPGRADE
Affected: >= 0.10.0 and < 0.11.1
Fixed in: 0.11.1
Safe to downgrade to: a release before 0.10.0
1. Check installed version
apt-cache policy open-webui || rpm -q open-webui || open-webui --version
2. UPGRADE to 0.11.1 (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 0.10.0 (Debian / Ubuntu)
apt-cache madison open-webui sudo apt install open-webui=<VERSION_BEFORE_0.10.0> 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_0.10.0> 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-2026-87998?

open webui: upgrade to 0.11.1. Exact commands for each OS are on this page.

Is CVE-2026-87998 being exploited?

CVE-2026-87998 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-2026-87998 affect?

CVE-2026-87998 affects open webui. Severity is high (CVSS 7.1). Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base b

How urgent is CVE-2026-87998?

Priority 40/100. High severity; Public exploit reference

Related CVEs

References

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