Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, administrative role changes and user deletions do not iterate SESSION_POOL to disconnect affected sessions. As a result, a user whose admin role has been revoked retains admin privileges within their existing Socket.IO session for as long as they keep the connection alive (via automatic heartbeats). The gap is exclusive to the Socket.IO session cache. This vulnerability is fixed in 0.9.0.
CVE-2026-44553
HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.1
- CVSS v3
- 8.1
- EG Score
- 8.1(medium)
- EPSS
- 10.0%
- KEV
- Not listed
Published
May 15, 2026
Last Modified
May 19, 2026
References (1)
- security-advisories@githubhttps://github.com/open-webui/open-webui/security/advisories/GHSA-45m8-cpm2-3v65
Frequently asked(5)
What is CVE-2026-44553?
CVE-2026-44553 is a high vulnerability published on May 15, 2026. Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, administrative role changes and user deletions do not iterate SESSION_POOL to disconnect affected sessions. As a result, a user whose admin role has been revoked retains admin…
When was CVE-2026-44553 disclosed?
CVE-2026-44553 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44553 actively exploited?
CVE-2026-44553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44553?
CVE-2026-44553 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-44553?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44553, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44553
Is Your Infrastructure Affected by CVE-2026-44553?
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