CVE-2026-45331
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
67/100
Published: 2026-05-15
Modified: 2026-11-11
First seen: 2026-11-11
Status: active
Attack Surface
Network
Low Complexity
No Interaction
Conf. Impact
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
None
S:
Changed
C:
High
I:
Low
A:
None
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, validate_url() in backend/open_webui/retrieval/web/utils.py calls validators.ipv6(ip, private=True), but the validators library does NOT implement the private keyword for IPv6 — the call raises a ValidationError (which is falsy in a boolean context), so every IPv6 address passes the filter. In addition, IPv4-mapped IPv6 (::ffff:10.0.0.1) bypasses the IPv4 check entirely, and several reserved IPv4 ranges (0.0.0.0/8, 100.64.0.0/10, 192.0.0.0/24, etc.) are not blocked. This vulnerability is fixed in 0.9.0.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| openwebui | open_webui | < 0.9.0 |
References & Advisories (1)
Exploit
Mitigation
Vendor Advisory