GCD AI RADAR
incidents/AIR-2026-0756

CVE-2026-54021: Open WebUI proxy bypass routes calls to arbitrary Ollama backends

Attack on AI2 Disclosed vulnerabilityInfrastructure vulnerability

Direct indexed Ollama proxy routes failed to validate backend authorization against requested indices, letting authenticated users access internal backends. The vulnerability exposes unauthorized higher-privilege or restricted Ollama instances.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Infrastructure vulnerability
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
owasp llm top 10
mitre atlas
no technique for these categories
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Framework / tooling
products
Open WebUI, Ollama
incident date
17 Jun 2026
first reported
17 Jun 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2026-54021 · open-webui · ollama · access-control
record
created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z · json

Sources · 2

  1. 2026-06-17
    CVE-2026-54021: Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter
    GitHub Advisory Database · github.com/advisories/GHSA-9rpj-v7hf-vv2w
  2. 2026-06-23
    CVE-2026-54021: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-54021

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