# CVE-2026-87017 — open-webui

> As of 2026-09-10, CVE-2026-87017 is a MEDIUM-severity vulnerability in open-webui, CVSS v3.1 4.3, EPSS 0.2% (11.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-87017 as of 2026-09-10; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-10

## What is CVE-2026-87017?

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.7.0 until 0.11.1, the built-in knowledge search tool passed the caller's readable knowledge identifiers through a metadata filter, but the search methods in eleven shipped vector backends ignored that filter. An authenticated user on an affected backend could enumerate the identifiers, names, and descriptions of inaccessible knowledge bases from the shared collection, although the associated document text remained in separate collections. This issue is fixed in version 0.11.1.

The record classifies CVE-2026-87017 under weakness classes [CWE-200](https://intel.threadlinqs.com/cwe/CWE-200), [CWE-863](https://intel.threadlinqs.com/cwe/CWE-863). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 26 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 11.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-09, last modified 2026-09-10

## Is CVE-2026-87017 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [open-webui](https://intel.threadlinqs.com/vendors/open-webui): open-webui

## How to fix CVE-2026-87017

No vendor patch reference has been recorded for CVE-2026-87017 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-87017

No threat campaign in the Threadlinqs corpus currently references CVE-2026-87017, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-09-11.

**Vendor advisory and patch**

- [github.com](https://github.com/open-webui/open-webui/security/advisories/GHSA-pcvc-8vrv-8q6w)

**Other references**

- [github.com](https://github.com/open-webui/open-webui/commit/1d6d4e6e6647e1d403438ede7bd9ba20bc4cc8f6)
- [github.com (v0.11)](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-87017
Full detection coverage and IOCs for threats exploiting CVE-2026-87017 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp