CVE-2026-56400
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 4.0
- 9.0 CRITICALCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.52% probability · 43th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-613
- Affected
- openwebui/open webui
- Source
- disclosure@vulncheck.com
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-6xcp-7mpr-m7wmVendor Advisory
- https://www.vulncheck.com/advisories/open-webui-remote-code-execution-via-cors-misconfiguration-and-session-validationExploit, Third Party Advisory
- https://github.com/open-webui/open-webui/security/advisories/GHSA-6xcp-7mpr-m7wmVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.