Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-87998

CVE-2026-87998HIGH

open-webui open-webui — Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  H  L    7.1   .0049   39.7     —

AFFECTED
  Product     Versions               Fixed
  open-webui  >= 0.10.0, < 0.11.1 –  —

TIMELINE
  Sep 9   Reserved by GitHub_M
  Sep 9   Published (CNA: GitHub_M)
  Sep 16  EXPLOIT PUBLISHED — CVE-2026-87998 (open-webui). Public exploit reference added.

CWE-269, CWE-863 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 9, 2026	Reserved	Reserved by GitHub_M
September 9, 2026	Published	Published (CNA: GitHub_M)
September 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87998 (open-webui). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.10.0, < 0.11.1	—

Weaknesses

CWE-269 · CWE-863

References (4)

https://github.com/open-webui/open-webui/commit/dc03e7e595d61be97b25a1dd7bb99ad264f73199 [Patch]
https://github.com/open-webui/open-webui/pull/28113 [Issue Tracking, Patch]
https://github.com/open-webui/open-webui/releases/tag/v0.11.1 [Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-2724-6cpj-gf3v [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-87998 at cve.org

Vendors: open-webui

Weaknesses: CWE-269 · CWE-863

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87998 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.