CVE Catalog

CVE-2026-54020

MediumCVSS 6.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.21%

12th percentile - higher than 12% of all known CVEs

Summary

Open WebUI prior to 0.11.0 resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but HTTP clients resolved the hostname again at connection time. An authenticated attacker controlling DNS could answer with a public address during validation and an internal one during connection, reaching internal services or cloud metadata, with most paths returning the response to the attacker and the OAuth path forwarding the OAuth access token. Fixed in 0.11.0.

Risk Assessment

An attacker can access internal resources and potentially steal OAuth tokens, leading to confidentiality breaches and privilege escalation.

Recommendation

Update Open WebUI to version 0.11.0 or later.

Other vulnerabilities in Open WebUI

See all
Original NVD description (English source)

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients resolved the hostname again at connection time. An authenticated attacker who controlled authoritative DNS for a submitted hostname could answer with a public address during validation and an internal one during connection, reaching cloud metadata, loopback admin APIs, or internal services through URL ingest, chat image_url fetches, image editing, or OAuth profile-picture fetches, with most paths returning the response to the attacker and the OAuth path forwarding the OAuth access token. This issue is fixed in 0.11.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS