# CVE-2026-87997 — open-webui

> As of 2026-09-09, CVE-2026-87997 is a MEDIUM-severity vulnerability in open-webui, CVSS v3.1 4.3, EPSS 0.2% (11.6th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-87997 as of 2026-09-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

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

## What is CVE-2026-87997?

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /api/chat/completions and POST /api/v1/chat/completions in backend/open_webui/main.py copied a client-supplied folder_id into a new chat without applying the folder write-access check used by the dedicated chat routes. An authenticated user who knew a shared folder identifier could inject an attacker-controlled chat into a folder where the user had read-only or no write access, causing the entry to appear to authorized folder readers. This issue is fixed in version 0.11.1.

The record classifies CVE-2026-87997 under weakness classes [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639), [CWE-862](https://intel.threadlinqs.com/cwe/CWE-862). 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:N/I:L/A:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 11.6% 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

## Is CVE-2026-87997 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

Affected software packages:

- `pip:open-webui` — patched in 0.11.1

## How to fix CVE-2026-87997

Fixed versions are recorded for 1 package: pip:open-webui 0.11.1. No vendor patch reference has been recorded for CVE-2026-87997 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-2026-87997

No threat campaign in the Threadlinqs corpus currently references CVE-2026-87997, 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, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-11. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28)

**Other references**

- [github.com](https://github.com/open-webui/open-webui/pull/28366)
- [github.com (d9e23b90c100d19b00270aea3cde0501d2354a6c)](https://github.com/open-webui/open-webui/commit/d9e23b90c100d19b00270aea3cde0501d2354a6c)
- [github.com (v0.11)](https://github.com/open-webui/open-webui/releases/tag/v0.11.1)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-87997
Full detection coverage and IOCs for threats exploiting CVE-2026-87997 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp