Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N H P N P H H H 9.0 .0035 28.0 —
AFFECTED Product Versions Fixed open-webui unspecified 0.3.14
TIMELINE Jun 21 Reserved by VulnCheck Jul 15 EXPLOIT PUBLISHED — CVE-2026-56400 (open-webui). Public exploit reference added. Jul 15 Published (CNA: VulnCheck)
open-webui before 0.3.14 contains a cross-origin resource sharing misconfiguration allowing arbitrary origins with allow_origins=* and authenticated requests to the /api/v1/functions endpoint. Attackers can execute arbitrary code on the openwebui instance by crafting malicious cross-site requests from attacker-controlled websites when an admin user visits them.
| Date | Event | Detail |
|---|---|---|
| June 21, 2026 | Reserved | Reserved by VulnCheck |
| July 15, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-56400 (open-webui). Public exploit reference added. |
| July 15, 2026 | Published | Published (CNA: VulnCheck) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| open-webui | open-webui | — | — | 0.3.14 |
Authoritative record: CVE-2026-56400 at cve.org
Vendors: open-webui
Weaknesses: CWE-613
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-56400 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.