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CVE-2026-87998

7.1 HIGHPublic exploitEPSS 0.27%
  1. Published9 Sept 2026

Description

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 base could delete shared instance configuration and make every other knowledge base using that connection unavailable. This issue is fixed in version 0.11.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Affected products

Openwebui Open Webui≥ 0.10.0 < 0.11.1

Remediation

Fixed in
Openwebui Open Webui≥ 0.11.1

References

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Frequently asked

Is CVE-2026-87998 being actively exploited?

CVE-2026-87998 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.27%.

How severe is CVE-2026-87998?

CVE-2026-87998 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.27% probability of exploitation.

Which products are affected by CVE-2026-87998?

Affected products include Openwebui Open Webui.

How do I fix CVE-2026-87998?

Upgrade affected software to a fixed version, for example Openwebui Open Webui 0.11.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-87998 against the real software inventory on every managed device, every day. 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.

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