CVE-2026-28786

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.8.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "open-webui", "source": "cna", "vendor": "open-webui"}, "product": "open-webui", "vendor": "open-webui"}], "analysis": {"en": {"generated_at": "2026-03-30T18:28:29.866586+00:00", "value": {"mitigation_remediation": ["Upgrade Open WebUI to version 0.8.6 or later, which removes the vulnerable filename handling.", "Verify that the /api/v1/audio/transcriptions endpoint no longer returns file path information in error responses.", "Ensure that only authorized administrators have permissions that could lead to unintended information disclosure.", "If an upgrade is not immediately possible, temporarily disable detailed error messages in the application configuration to prevent path disclosure."], "summary": {"action": "Apply patch", "impact": "Information Disclosure"}, "threat_synthesis": {"affected_systems": "Open WebUI, versions prior to 0.8.6, across all default deployments. The affected component is the /api/v1/audio/transcriptions endpoint in the self\u2011hosted artificial intelligence platform.", "description_and_impact": "An unsanitized filename field in the speech\u2011to\u2011text transcription endpoint causes a FileNotFoundError whose message includes the server\u2019s absolute DATA_DIR path. The HTTP 400 response returns this message verbatim, revealing directory structure information to any authenticated non\u2011admin user. The vulnerability does not allow remote code execution but does enable an attacker to gather internal file system details that could assist further attacks.", "risk_and_exploitability": "The CVSS score of 4.3 indicates a moderate impact, and the EPSS score below 1% suggests low likelihood of exploitation in the wild. It is not listed in the CISA KEV catalog. Attackers need authenticated non\u2011admin access to trigger the error, so the threat is limited to users who can log in to the application. Nonetheless, disclosure of absolute paths can aid attackers in mapping the system, so the risk is non\u2011zero for exposed deployments."}}}}, "created": "2026-03-27T08:31:23.144129+00:00", "updated": "2026-03-30T20:57:20.485519+00:00", "vendors": ["open-webui", "open-webui$PRODUCT$open-webui"]}