CVE-2026-45667: Open WebUI: Unauthenticated endpoint can trigger embedding generation (cost/DoS)

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-15 · updated 2026-06-17
Weakness: CWE-862

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.0, GET /api/v1/memories/ef is accessible without authentication and executes request.app.state.EMBEDDING_FUNCTION(...). This allows any unauthenticated caller to trigger embedding generation which can lead to direct cost exposure if a paid provider is used. This vulnerability is fixed in 0.8.0.

Affected products

open-webui: before 0.8.0 — fixed in 0.8.0

How to fix

Upgrade to a fixed version: open-webui 0.8.0. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-45667 or the next vulnerability affects your stack