by Kastro
Paper/Archive/CVE-2026-56400

CVE-2026-56400

open-webui open-webui — open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation

EPSS 0.5%public exploitCVSS 9.6
critical.is priorityof 100
48
CVSS 9.6 (NVD)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 44.2.442 × 208.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
open-webui< 0.3.140.3.14CNA

Scores by source

NVD9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
VulnCheck (CNA)9.0CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)8.3CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/open-webui/open-webui/security/advisories/GHSA-6xcp-7mpr-m7wmwriteupvulncheck.com/advisories/open-webui-remote-code-execution-via-cors-misconfiguration-and-session-validation