What is CVE-2026-54020?

CVE-2026-54020 is a medium-severity vulnerability in Open-webui, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.3/10. Published 2026-08-04.

How severe is CVE-2026-54020?

Medium severity. CVSS v3 base score is 6.3 out of 10.

SSRF in Open-webui

CVE-2026-54020

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.11.0, Open WebUI resolved a hostname during URL validation and rejected private, loopback, and link-local addresses, but the HTTP clients reso…

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Open-webui — versions < 0.11.0

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-54020?: CVE-2026-54020 is a medium-severity vulnerability in Open-webui, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.3/10. Published 2026-08-04.
How severe is CVE-2026-54020?: Medium severity. CVSS v3 base score is 6.3 out of 10.