Is CVE-2026-45331 actively exploited?

No active exploitation of CVE-2026-45331 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45331 be exploited remotely?

Yes. CVE-2026-45331 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45331?

CVE-2026-45331 has a CVSS score of 8.5 (HIGH).

HOME VULNERABILITIESCVE-2026-45331

HIGH

CVE-2026-45331

CWE-918Published: May 15, 2026· Updated: May 19, 2026

8.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:10.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-45331 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.5.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.